What is "fuel efficiency"?

What is "fuel efficiency"?

Terry Tamminen (Author & Environmental Policy Advisor) gives expert video advice on: Why is fuel efficiency important to the environment?; How does the weight of my car affect fuel efficiency? and more...

Fuel efficiency is the measure of how many miles per gallon you get. Of course if you have some other kind of a fuel, like natural gas or electricity, fuel efficiency would be measured in something else. But fuel efficiency is a way of saying how much energy do you put in, versus what kind of distance do you get out of that particular fuel.