"Fuel efficiency" refers to how well a vehicle or machine uses fuel to do its work. It means that the vehicle or machine can travel a longer distance or perform more tasks using less fuel. Full definition
This cars electric and gas powertrain is expected to give you an average of combined fuel efficiency of 38 mpg. (thesupercars.org)
The brake calipers are designed to reduce brake drag when not in use, reducing rolling resistance and improving fuel efficiency in the process. (netcarshow.com)
Consider contacting your representative about implementing a fuel tax or raising the standards for fuel efficiency in your state. (nwei.org)