what four wheel drive gets great gas mileage
It would depend on what you needs are. Let start with SUV or pickup truck.
I use to have a 4x4 Ford Explorer, it was great on gas, and with the right tires on it, it'll get you through some tough conditions.
What do you consider great MPG?
Escape/Tribute/Mariner comes to mind. Any Subaru.
Be careful of the newer Subaru's.