The phrase "extra mpg" means getting better mileage or more distance per gallon of fuel.
Sentences with «extra mpg»
Especially when the price premium on the fuel costs you more than the few extra mpg you get. (hybridcars.com)
Updates include the usual bumper treatment changes and a few extra mpg and horsepower under the hood. (topspeed.com)
Alternatively, the Levante could be taking cues from the Chrysler Pacifica Hybrid for extra mpg at the pump, adding electric motivation to the mix. (topspeed.com)