The phrase
"decent mpg" means that a vehicle is capable of achieving a reasonably good amount of miles per gallon of fuel.
Full definition
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.»
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.
They are usually reliable, have ample power, and at the time, had
decent mpg.
BMW has the 335d but at over 50K for a little car that is absurd with only
a decent mpg (Jetta is basically the same size and half the price) If BMW would bring over a true high mileage vehicle like the x1 I think it would do quite well.
Quiet, good performance and
decent mpg.