Question

what do you mean by fuel effeciency

Answer 1

Fuel efficiency is a form of thermal efficiency, meaning the ratio from effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work. Overall fuel efficiency may vary per device, which in turn may vary per application fuel efficiency, especially fossil fuel power plants or industries dealing with combustion, such as ammonia production during the Haber process.

Answer 2

the capacity of an engine , especially that of a vehicles , to obtain energy from fuel is called as fuel effeciency..