Editing Fuel efficiency (section)

==Vehicle design==
Fuel efficiency is dependent on many parameters of a vehicle, including its [[engine]] parameters, [[Drag (physics)|aerodynamic drag]], weight, AC usage, fuel and [[rolling resistance]]. There have been advances in all areas of vehicle design in recent decades. Fuel efficiency of vehicles can also be improved by careful maintenance and driving habits.<ref>{{Cite news|url=https://www.carsangrah.com/blog/simple-tips-tricks-enhance-fuel-efficiency-car|title=Simple tips and tricks to increase fuel efficiency of your car {{!}} CarSangrah|date=2018-06-07|work=CarSangrah|access-date=2018-07-24|language=en-US}}</ref>

[[Hybrid vehicles]] use two or more power sources for propulsion. In many designs, a small combustion engine is combined with electric motors.  Kinetic energy which would otherwise be lost to heat during braking is recaptured as electrical power to improve fuel efficiency. The larger batteries in these vehicles power the [[Automotive electronics|car's electronics]], allowing the engine to shut off and avoid prolonged [[Start-stop system|idling]].<ref>{{cite web|title=How Hybrids Work|url=http://www.fueleconomy.gov|publisher=[[U.S. Department of Energy]]|access-date=2014-01-16|url-status=live|archive-url=https://web.archive.org/web/20150708093450/http://www.fueleconomy.gov/|archive-date=2015-07-08}}</ref>