The phrase "decent mpg" means that a vehicle is capable of achieving a reasonably good amount of miles per gallon of fuel.
Sentences with «decent mpg»
If you were to say, «I need a pretty decent Pre-Owned truck with one owner, oil changed regularly, locally owned, gets decent MPGs, and has a ton of space.» (smartcarguide.com)
I wanted a mid-size awd car that's comfortable, looks great, gets decent mpg's despite Boston traffic and had nice options for a good price. (edmunds.com)
They are usually reliable, have ample power, and at the time, had decent mpg. (autolist.com)