Fuel efficiency

Fuel Efficiency
The proportion of energy released by fuel combustion that is converted into useful energy.
Fuel Switching ...

fuel efficiency The proportion of the energy released on combustion of a fuel that is converted into useful energy.
fuel pellet A cylindrical pellet of nuclear fuel typically consisting of uranium dioxide.

F fuel efficiency
Definition (english only)
The proportion of energy released by fuel combustion that is converted into useful energy.

And, yes, another component of the Energy Policy Act is the Federal Hybrid HOV Waiver, which allows states to open their high-occupancy vehicle (HOV) lanes to hybrid cars that get at least 50 percent better fuel efficiency in the city and 25 percent ...

See also: Environment, Environmental, Efficiency, Fuel, Waste