Editing Petrol engine (section)

== Power output and efficiency ==
{{main|Engine power|Engine efficiency#Gasoline (petrol) engines}}

The power output of small- and medium-sized petrol engines (along with equivalent engines using other fuels) is usually measured in [[Watt#Kilowatt|kilowatts]] or [[horsepower]].

Typically, petrol engines have a [[thermodynamic efficiency]] of about 20-30% (approximately half that of some diesel engines).<ref>{{Cite news|url=http://www.greencarreports.com/news/1091436_toyota-gasoline-engine-achieves-thermal-efficiency-of-38-percent|title=Toyota Gasoline Engine Achieves Thermal Efficiency Of 38 Percent|work=Green Car Reports|access-date=2017-10-07|language=en}}</ref>