Sentences with phrase «fuel management cylinder»

For improved economy, the gasoline units feature stop / start technology and Dynamic Fuel Management cylinder shut - off tech.

Chevrolet introduces Dynamic Fuel Management cylinder deactivation on 2019 Silverado; Tula Dynamic Skip Fire

2019 Chevrolet Silverado 1500 offered with new 4 - cylinder turbo with Active Fuel Management cylinder deactivation

All of the Sierra's V8 engines can run on E85, and the 5.3 - liter V8 includes Active Fuel Management cylinder deactivation technology for maximum fuel efficiency.

This engine gets the same direct injection, variable valve timing, and Active Fuel Management cylinder - deactivation featured in the Silverado.

With the new gearbox and seamless Active Fuel Management cylinder deactivation system allowing the engine to operate in eight - or four - cylinder modes, the drivetrain combo is estimated to return 14 mpg in the city and 21 mpg on the highway.

To improve fuel efficiency, the engine utilizes Active Fuel Management cylinder deactivation.

Furthermore, this engine also features technologies like Active Fuel Management cylinder deactivation and variable valve timing.

Not exact matches

Variable Cylinder Management, now standard across the board, is capable of turning the six - cylinder into either a four - or three - cylinder engine during low - load cruising, and with the Touring models» six - speed automatic (a five - speed is standard on other trim levels), the Odyssey returns the best EPA fuel economy at 19/28 mpg city / Cylinder Management, now standard across the board, is capable of turning the six - cylinder into either a four - or three - cylinder engine during low - load cruising, and with the Touring models» six - speed automatic (a five - speed is standard on other trim levels), the Odyssey returns the best EPA fuel economy at 19/28 mpg city / cylinder into either a four - or three - cylinder engine during low - load cruising, and with the Touring models» six - speed automatic (a five - speed is standard on other trim levels), the Odyssey returns the best EPA fuel economy at 19/28 mpg city / cylinder engine during low - load cruising, and with the Touring models» six - speed automatic (a five - speed is standard on other trim levels), the Odyssey returns the best EPA fuel economy at 19/28 mpg city / highway.

Plan on direct fuel injection, variable valve timing, and active fuel management (cylinder shutdown) to keep the pushrod V - 8s in play.

The 5.3 - liter V - 8 in the 1500 can run on regular gas or E85 ethanol and uses Active Fuel Management to shut down cylinders to improve fuel econFuel Management to shut down cylinders to improve fuel econfuel economy.

The clean - sheet fifth - generation small - block maintains the pushrod legacy while integrating a host of new technologies, such as direct injection and standard cylinder deactivation (marketed as Active Fuel Management), which work in tandem to deliver outstanding real - world fuel econFuel Management), which work in tandem to deliver outstanding real - world fuel econfuel economy.

Fuel economy is boosted by Active Fuel Management technology that enables it to run on just four cylinders.

All engines get redesigned combustion systems, with gas direct - injection, continuously variable valve timing and cylinder deactivation, which GM calls Active Fuel Management.

The 5.3 - liter V - 8 in the 1500 can run on E85 and uses Active Fuel Management to shut down cylinders to improve fuel econFuel Management to shut down cylinders to improve fuel econfuel economy.

For now, the XT5 is powered by one engine, a 310 - hp, 3.6 - liter V - 6 with an active fuel management system that can shut off two cylinders when full power is not needed, mated to a new eight - speed automatic transmission.

Chevrolet claims that the Suburban will be the most fuel - efficient model in the full - size SUV class, thanks to tech such as direct injection and active fuel management (cylinder deactivation).

The M152 engine is closely related to the M157 bi-turbo found in larger AMG models, but uses a host of fuel - saving methods, such as AMG Cylinder Management, start / stop and, of course, no turbocharging to keep its drinking levels down.

It is the AMG Cylinder Management cylinder shut - off system in particular — completely newly developed by Mercedes - AMG — that significantly improves efficiency: cylinders two, three, five and eight are cut off under partial load, which lowers fuel consumption consiCylinder Management cylinder shut - off system in particular — completely newly developed by Mercedes - AMG — that significantly improves efficiency: cylinders two, three, five and eight are cut off under partial load, which lowers fuel consumption consicylinder shut - off system in particular — completely newly developed by Mercedes - AMG — that significantly improves efficiency: cylinders two, three, five and eight are cut off under partial load, which lowers fuel consumption considerably.

A Variable Cylinder Management (VCM) system is present, which automatically enables and disables the cylinders according to the requirement, making the car fuel - efficient, without affecting the acceleration.

All of these engines are fitted with three technologies aimed at improving fuel economy (which is where the 3 in the EcoTec3 name comes from): direct fuel injection, continuously variable valve timing, and active fuel management, better known as cylinder deactivation.

A separate throttle butterfly for each cylinder - a feature adapted from the M's racing heritage - provides immediate reaction to the accelerator pedal at any rpm and double - VANOS variable camshaft management delivers fast valve timing adjustments to enhance power, torque, fuel economy and emissions all at once.

In addition, the automatic - equipped EX-L offers a 3.5 - liter V6 with an updated version of Honda's Variable Cylinder Management (VCM) technology that saves fuel by allowing the engine to run on six, four or three cylinders, according to demand.

Honda's i - VTEC ® enhances power delivery while Variable Cylinder Management ™ (VCM ®) helps maximize fuel efficiency and reduce emissions.

If the origin of the shaking is the engine (as opposed to a problem with wheel imbalance, suspension faults, etc.), it's either motor mounts or an engine management fault (ignition, fuel, air induction, etc. but also including uneven cylinder compression...

This engine features Chevy's Active Fuel Management system, which cuts power from eight to four cylinders under light - load situations.

ABS,4 - Wheel Disc Brakes,5 - Speed A / T, A / C, A / T, 3 rd Row Seat, Adjustable Steering Wheel, Security System, Aluminum Wheels, AM / FM Stereo, Automatic Headlights, Power Outlet, Brake Assist, Bucket Seats, CD Changer, CD Player, Child Safety Locks, Climate Control, Cruise Control, Driver Air Bag, Driver Illuminated Vanity Mirror, Driver Adjustable Lumbar, Driver Vanity Mirror,Multi - Zone A / C, Stability Control, Fog Lamps, Four Wheel Drive, Floor Mats, Gasoline Fuel, Heated Front Seat (s), Heated Mirrors, Intermittent Wipers, Keyless Entry, Leather Seats, Leather Steering Wheel,Pass - Through Rear Seat, Passenger Air Bag, Passenger Air Bag Sensor, Passenger Illuminated Visor Mirror, Passenger Vanity Mirror, Power Door Locks, Power Mirror (s), Power Driver Seat, Power Steering, Sun / Moonroof, Power Windows, Premium Sound System, Privacy Glass, Rear A / C, Rear Defrost, Rear Head Air Bag, Rear Reading Lamps, Rear Spoiler, Satellite Radio, Front Side Air Bag, Front Head Air Bag, Steering Wheel Audio Controls, Sun / Moon Roof, Tire Pressure Monitor, Tires - Front All - Season, Tires - Rear All - Season, Traction Control, Universal Garage Door Opener, V6 Cylinder Engine, Variable Speed Intermittent Wipers, Engine Immobilizer,Body - colored body side moldings,Body - colored bumpers,Body - colored door handles,Body - colored pwr heated mirrors,Body - colored rear roofline spoiler, Fog lights,Heat - rejecting glass, Intermittent rear window wiper / washer, Projector beam halogen headlamps w / auto - off, Pwr moonroof w / tilt feature, Rear privacy glass, Roof rails, Side marker lights, Variable intermittent windshield wipers, (4) 12V pwr outlets, (9) beverage holders, 2 nd & 3rd row 60/40 split flat - folding bench seats, 2 nd & 3rd row grab rails w / integrated map lights, 2 nd row fold down activity tray, Adjustable steering column, AM / FM stereo w / 6 - disc in - dash CD changer - inc: (6) speakers, subwoofer, Ambient console lighting, Cargo area - inc: cargo net, cargo light, (6) tie - down anchors, (9) bag hooks, Conversation mirror w / sunglasses holder, Courtesy door lights, Cruise control, Dual illuminated visor vanity mirrors, Floor mats, Head restraints at all seating positions, HomeLink remote system, Immobilizer theft - deterrent system, Indicator lights - inc: low - fuel, low - oil pressure, door / tailgate open, passenger airbags status, vehicle stability assist, Integrated glass antenna,Leather - trimmed heated front bucket seats - inc: 8 - way pwr driver seat, driver adjustable lumbar support,Leather - wrapped shift knob, Maintenance minder system, Multifunctional center console w / storage, cell phone cradle, Perforated leather - wrapped steering wheel, Pwr door & tailgate locks, Pwr windows w / driver auto - up / down, Rear hidden storage compartment, Rear seat heater ducts, Rear window defroster w / timer, Rearview mirror w / compass, Remote fuel filler door release, Remote keyless entry, Security system, Sliding sunvisor extensions, Steering wheel - mounted audio controls, Synchronized automatic tri-zone climate control system, Tire pressure monitoring system, Upper / lower front row seatback pockets, XM satellite radio w / 90 - day subscription, 16 \ \ \» machine - finished alloy wheels, 3.5 L SOHC MPFI 24 - valve VTEC V6 engine,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), 5 - speed automatic transmission w / OD, Brake assist,Drive - by - wire throttle, Front / rear stabilizer bars, MacPherson strut front suspension,Multi - link rear suspension w / trailing arms, P235 / 70SR16 all - season tires, Pwr ventilated front / solid rear disc brakes, Variable pwr rack & pinion steering, Variable Torque Management (VTM - 4) 4 - wheel drive system, Vehicle Stability Assist (VSA) w / traction control, 2 nd row lower anchors & tethers for children (LATCH), 3 - point seat belts in all seating positions - inc: front automatic tensioning system, front adjustable seat belt anchors, 3 rd row child seat tether anchors,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), Brake assist,Child - proof rear door locks, Dual front side - impact airbags w / passenger side occupant position detection system,Dual - stage, dual - threshold front airbags, Side curtain airbags on all rows w / rollover sensor,Side - impact door beams, Vehicle Stability Assist (VSA) w / traction control Stock Number: 022026 This vehicle added by www.LIUsedCars.Fuel, Heated Front Seat (s), Heated Mirrors, Intermittent Wipers, Keyless Entry, Leather Seats, Leather Steering Wheel,Pass - Through Rear Seat, Passenger Air Bag, Passenger Air Bag Sensor, Passenger Illuminated Visor Mirror, Passenger Vanity Mirror, Power Door Locks, Power Mirror (s), Power Driver Seat, Power Steering, Sun / Moonroof, Power Windows, Premium Sound System, Privacy Glass, Rear A / C, Rear Defrost, Rear Head Air Bag, Rear Reading Lamps, Rear Spoiler, Satellite Radio, Front Side Air Bag, Front Head Air Bag, Steering Wheel Audio Controls, Sun / Moon Roof, Tire Pressure Monitor, Tires - Front All - Season, Tires - Rear All - Season, Traction Control, Universal Garage Door Opener, V6 Cylinder Engine, Variable Speed Intermittent Wipers, Engine Immobilizer,Body - colored body side moldings,Body - colored bumpers,Body - colored door handles,Body - colored pwr heated mirrors,Body - colored rear roofline spoiler, Fog lights,Heat - rejecting glass, Intermittent rear window wiper / washer, Projector beam halogen headlamps w / auto - off, Pwr moonroof w / tilt feature, Rear privacy glass, Roof rails, Side marker lights, Variable intermittent windshield wipers, (4) 12V pwr outlets, (9) beverage holders, 2 nd & 3rd row 60/40 split flat - folding bench seats, 2 nd & 3rd row grab rails w / integrated map lights, 2 nd row fold down activity tray, Adjustable steering column, AM / FM stereo w / 6 - disc in - dash CD changer - inc: (6) speakers, subwoofer, Ambient console lighting, Cargo area - inc: cargo net, cargo light, (6) tie - down anchors, (9) bag hooks, Conversation mirror w / sunglasses holder, Courtesy door lights, Cruise control, Dual illuminated visor vanity mirrors, Floor mats, Head restraints at all seating positions, HomeLink remote system, Immobilizer theft - deterrent system, Indicator lights - inc: low - fuel, low - oil pressure, door / tailgate open, passenger airbags status, vehicle stability assist, Integrated glass antenna,Leather - trimmed heated front bucket seats - inc: 8 - way pwr driver seat, driver adjustable lumbar support,Leather - wrapped shift knob, Maintenance minder system, Multifunctional center console w / storage, cell phone cradle, Perforated leather - wrapped steering wheel, Pwr door & tailgate locks, Pwr windows w / driver auto - up / down, Rear hidden storage compartment, Rear seat heater ducts, Rear window defroster w / timer, Rearview mirror w / compass, Remote fuel filler door release, Remote keyless entry, Security system, Sliding sunvisor extensions, Steering wheel - mounted audio controls, Synchronized automatic tri-zone climate control system, Tire pressure monitoring system, Upper / lower front row seatback pockets, XM satellite radio w / 90 - day subscription, 16 \ \ \» machine - finished alloy wheels, 3.5 L SOHC MPFI 24 - valve VTEC V6 engine,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), 5 - speed automatic transmission w / OD, Brake assist,Drive - by - wire throttle, Front / rear stabilizer bars, MacPherson strut front suspension,Multi - link rear suspension w / trailing arms, P235 / 70SR16 all - season tires, Pwr ventilated front / solid rear disc brakes, Variable pwr rack & pinion steering, Variable Torque Management (VTM - 4) 4 - wheel drive system, Vehicle Stability Assist (VSA) w / traction control, 2 nd row lower anchors & tethers for children (LATCH), 3 - point seat belts in all seating positions - inc: front automatic tensioning system, front adjustable seat belt anchors, 3 rd row child seat tether anchors,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), Brake assist,Child - proof rear door locks, Dual front side - impact airbags w / passenger side occupant position detection system,Dual - stage, dual - threshold front airbags, Side curtain airbags on all rows w / rollover sensor,Side - impact door beams, Vehicle Stability Assist (VSA) w / traction control Stock Number: 022026 This vehicle added by www.LIUsedCars.fuel, low - oil pressure, door / tailgate open, passenger airbags status, vehicle stability assist, Integrated glass antenna,Leather - trimmed heated front bucket seats - inc: 8 - way pwr driver seat, driver adjustable lumbar support,Leather - wrapped shift knob, Maintenance minder system, Multifunctional center console w / storage, cell phone cradle, Perforated leather - wrapped steering wheel, Pwr door & tailgate locks, Pwr windows w / driver auto - up / down, Rear hidden storage compartment, Rear seat heater ducts, Rear window defroster w / timer, Rearview mirror w / compass, Remote fuel filler door release, Remote keyless entry, Security system, Sliding sunvisor extensions, Steering wheel - mounted audio controls, Synchronized automatic tri-zone climate control system, Tire pressure monitoring system, Upper / lower front row seatback pockets, XM satellite radio w / 90 - day subscription, 16 \ \ \» machine - finished alloy wheels, 3.5 L SOHC MPFI 24 - valve VTEC V6 engine,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), 5 - speed automatic transmission w / OD, Brake assist,Drive - by - wire throttle, Front / rear stabilizer bars, MacPherson strut front suspension,Multi - link rear suspension w / trailing arms, P235 / 70SR16 all - season tires, Pwr ventilated front / solid rear disc brakes, Variable pwr rack & pinion steering, Variable Torque Management (VTM - 4) 4 - wheel drive system, Vehicle Stability Assist (VSA) w / traction control, 2 nd row lower anchors & tethers for children (LATCH), 3 - point seat belts in all seating positions - inc: front automatic tensioning system, front adjustable seat belt anchors, 3 rd row child seat tether anchors,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), Brake assist,Child - proof rear door locks, Dual front side - impact airbags w / passenger side occupant position detection system,Dual - stage, dual - threshold front airbags, Side curtain airbags on all rows w / rollover sensor,Side - impact door beams, Vehicle Stability Assist (VSA) w / traction control Stock Number: 022026 This vehicle added by www.LIUsedCars.fuel filler door release, Remote keyless entry, Security system, Sliding sunvisor extensions, Steering wheel - mounted audio controls, Synchronized automatic tri-zone climate control system, Tire pressure monitoring system, Upper / lower front row seatback pockets, XM satellite radio w / 90 - day subscription, 16 \ \ \» machine - finished alloy wheels, 3.5 L SOHC MPFI 24 - valve VTEC V6 engine,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), 5 - speed automatic transmission w / OD, Brake assist,Drive - by - wire throttle, Front / rear stabilizer bars, MacPherson strut front suspension,Multi - link rear suspension w / trailing arms, P235 / 70SR16 all - season tires, Pwr ventilated front / solid rear disc brakes, Variable pwr rack & pinion steering, Variable Torque Management (VTM - 4) 4 - wheel drive system, Vehicle Stability Assist (VSA) w / traction control, 2 nd row lower anchors & tethers for children (LATCH), 3 - point seat belts in all seating positions - inc: front automatic tensioning system, front adjustable seat belt anchors, 3 rd row child seat tether anchors,4 - wheel anti-lock braking system (ABS) w / electronic brake distribution (EBD), Brake assist,Child - proof rear door locks, Dual front side - impact airbags w / passenger side occupant position detection system,Dual - stage, dual - threshold front airbags, Side curtain airbags on all rows w / rollover sensor,Side - impact door beams, Vehicle Stability Assist (VSA) w / traction control Stock Number: 022026 This vehicle added by www.LIUsedCars.com.

The jewel of the 2012 Honda Accord Sedan's three - engine lineup is its 3.5 - liter V6 featuring an updated version of Honda's Variable Cylinder Management (VCM) technology that saves fuel by allowing the engine to run on six, four or three cylinders, according to demand.

All Pilots are powered by a 280 - horsepower 3.5 L V6 i - VTEC engine that utilizes variable cylinder management to allow the engine to run on just three or four cylinders when cruising or coasting in order to save fuel.

The 5.3 L V8 sports the impressive active fuel management feature that deactivates four of the eight cylinders and propels the vehicle on just four cylinders in instances where extra power is not needed.

It also features a direct fuel injection system and Active Cylinder Management.

The system works equally well on the highway, and when the V6 slips into variable cylinder management mode, you can hardly tell the difference, save for a few short movements by the fuel economy gauge next to the speedometer.

Also on tap as options are the Flex Fuel version of the 5.3 as well as two different versions of a 6.0 liter, 366 horsepower 8 - cylinder, one of which uses active fuel management and one of which doesFuel version of the 5.3 as well as two different versions of a 6.0 liter, 366 horsepower 8 - cylinder, one of which uses active fuel management and one of which doesfuel management and one of which doesn't.

As a member of Honda's EarthDreams powertrain series, this SOHC engine features direct fuel injection and Variable Cylinder Management for freeway fuel savings.

Thanks to the cylinder shut - off (ACT or active cylinder management) used exclusively for this engine, it offers maximum dynamic performance together with maximum fuel efficiency.

The 2009 Honda Odyssey also offers a more fuel efficient version of the optional Variable Cylinder Management (VCM) system.

While it doesn't offer stop / start, it does have Active Fuel Management — GM - speak for variable cylinder management, meaning the engine can run on fewer cylinders under liManagement — GM - speak for variable cylinder management, meaning the engine can run on fewer cylinders under limanagement, meaning the engine can run on fewer cylinders under light loads.

The engine is a 400hp, twin - turbo 3.0 L V - 6 with Active Fuel Management (cylinder deactivation) and Stop / Start technology.

In part - load operation, indirect injection supplements direct gasoline injection to improve fuel economy; the exhaust manifold that is integrated in the cylinder head enables high - performance thermal management.

To save fuel, the Silverado debuts GM's Dynamic Fuel Management, or variable cylinder shutdfuel, the Silverado debuts GM's Dynamic Fuel Management, or variable cylinder shutdFuel Management, or variable cylinder shutdown.

This Cadillac includes: SHALE WITH COCOA ACCENTS, LEATHER SEATING SURFACES WITH MINI PERFORATED INSERTS Leather Seats TRANSMISSION, 8 - SPEED AUTOMATIC, 8L90 (STD) 8 - Speed A / T A / T ASSIST STEPS, POWER - RETRACTABLE, RUNNING SIDE BOARD WITH LED LIGHTING Power Retractable Running Boards Running Boards / Side Steps SEATS, SECOND ROW 60/40 SPLIT - FOLDING BENCH, POWER CONFIGURABLE Rear Bench Seat Pass - Through Rear Seat SEATS, FRONT BUCKET Seat Memory Power Passenger Seat Power Driver Seat Heated Front Seat (s) Passenger Adjustable Lumbar Leather Seats Driver Adjustable Lumbar Bucket Seats CRYSTAL WHITE TRICOAT PREMIUM COLLECTION PREFERRED EQUIPMENT GROUP CADILLAC CUE INFORMATION AND MEDIA CONTROL SYSTEM WITH EMBEDDED NAVIGATION 8» Navigation System Auxiliary Audio Input MP3 Player WHEELS, 22» Aluminum Wheels ENGINE, 6.2 L V8 WITH ACTIVE FUEL MANAGEMENT 8 Cylinder Engine Gasoline Fuel * Note - For third party subscriptions or services, please contact the dealer for more informatFUEL MANAGEMENT 8 Cylinder Engine Gasoline Fuel * Note - For third party subscriptions or services, please contact the dealer for more informatFuel * Note - For third party subscriptions or services, please contact the dealer for more information.

Active Fuel Management which shuts off four of the eight or two of the six cylinders for better fuel econFuel Management which shuts off four of the eight or two of the six cylinders for better fuel econfuel economy.

Also new this year is a front - wheel - drive Pilot with Honda's fuel - saving Variable Cylinder Management (VCM) feature for its V6 engine.

Cadillac's all - new six cylinder engine contains Active Fuel Management, or cylinder deactivation, technology enabling it to seamlessly switch from six - cylinder to four - cylinder operation under certain light - load conditions, while maintaining excellent performance.

This GMC includes: ENGINE, VORTEC 5.3 L V8 SFI FLEXFUEL WITH ACTIVE FUEL MANAGEMENT Flex Fuel Capability 8 Cylinder Engine * Note - For third party subscriptions or servicesFUEL MANAGEMENT Flex Fuel Capability 8 Cylinder Engine * Note - For third party subscriptions or servicesFuel Capability 8 Cylinder Engine * Note - For third party subscriptions or services,...

Not that anyone would care, but the V8 engine features an AMG Cylinder Management cylinder deactivation system that shuts off four cylinders in partial - load conditions to reduce fuel consumption — the official combined figure is 13.2 l / 100 km with CO2 emissions of 299Cylinder Management cylinder deactivation system that shuts off four cylinders in partial - load conditions to reduce fuel consumption — the official combined figure is 13.2 l / 100 km with CO2 emissions of 299cylinder deactivation system that shuts off four cylinders in partial - load conditions to reduce fuel consumption — the official combined figure is 13.2 l / 100 km with CO2 emissions of 299 g / km.

To achieve this Prius - like fuel economy, the BlueMotion Concept is equipped with an Active Cylinder Management (ACM) technology that deactivates cylinders two and three under light loads, and a stop / start system that shuts off the engine when the car comes to a stop.

It also gets the active cylinder management system which cuts fuel supply to some cylinders to save fuel while cruising or coasting.

Engine: 1.8 L, 4 - cylinder hybrid, continuously variable Fuel Economy: 4.8 L / 100 km Prius is a name immediately associated with fuel efficiency and environmentally friendly driving, the v features Hybrid Synergy Drive, a system built around an Atkinson cycle 1.8 - L four - cylinder engine, high - torque electric motor, high - capacity storage battery and power management sysFuel Economy: 4.8 L / 100 km Prius is a name immediately associated with fuel efficiency and environmentally friendly driving, the v features Hybrid Synergy Drive, a system built around an Atkinson cycle 1.8 - L four - cylinder engine, high - torque electric motor, high - capacity storage battery and power management sysfuel efficiency and environmentally friendly driving, the v features Hybrid Synergy Drive, a system built around an Atkinson cycle 1.8 - L four - cylinder engine, high - torque electric motor, high - capacity storage battery and power management system.

6.2 - liter engine now equipped with Active Fuel Management technology, which helps increase fuel efficiency by shutting off half of the engine's cylinders in certain driving conditFuel Management technology, which helps increase fuel efficiency by shutting off half of the engine's cylinders in certain driving conditfuel efficiency by shutting off half of the engine's cylinders in certain driving conditions