The phrase "efficient engines" refers to engines that can produce more power or energy while using less fuel or resources. It means they are designed to do their job effectively and minimize waste. Full definition
This truck was completely redesigned from the previous generation with similar, but more efficient engine options and more aerodynamic body styling. (iseecars.com)
The model offers an updated exterior and interior look, plus a more powerful and more fuel efficient engine that promises best - in - class fuel economy. (topspeed.com)
This powerful little sedan offers the latest technology and fuel efficient engine options, making it a great choice for a car that is both fun to drive, and affordable. (palmendodgechryslerjeepofracine.com)