Hypermiling is driving or flying a vehicle with techniques that maximize fuel efficiency. Those who use these techniques are called "hypermilers".[1] In the case of cars, this is an extreme form of energy-efficient driving.
Hypermiling can be practiced in any vehicle regardless of fuel consumption. It gained popularity due to the rise in gasoline prices in the 2000s.[2] Some hypermiling techniques are illegal in some countries because they are dangerous.[3] In 2008, the New Oxford American Dictionary voted "hypermiling" the best new word of the year.[4]