I have a 2000 5.9 2WD. Mileage is better than what it replaced ('79 W200 club cab long bed 360). Right now it's really the only vehicle that we take anywhere if it's both of us as my wife has trouble getting in and out of the BMW. With what I've about the 4.7 I wouldn't own one and the one that I did rent (Dakota extended cab) got poor fuel mileage similar to the 5.9 Durango.