Many hybrid electric vehicles achieve higher fuel economy ratings in the city (
e.g. 2017 Toyota Prius, 54 - city, 50 - highway) than on the highway because the electric motor recharges when
braking and turns off the gas -
powered engine when stopped; this is especially beneficial to those who do a lot of city driving because, while 100 % gas vehicles will get better mileage on the highway vs. the city, hybrids are the opposite.
In the filing for a patent awarded in 2014 on the design of a system for vehicle dynamics control in electric vehicles, Ian Wright, currently the founder and CEO of Wrightspeed (earlier post) and a co-founder of Tesla Motors, and his co-inventor Ryan Cash explain that existing control systems for vehicle dynamics —
e.g., Electronic Stability Control, Traction Control, and Anti-Lock Braking — exercise control over engine
power, and may automatically apply and release
brakes on each wheel independently.