I am looking to buy a used certified GC 02-04 w/ the 4.7 and 4wd, but was wondering what kind of gas mileage I can expect. It will be for the wife and she drives a Honda Civic now so we know if will be a bigger expense, but 4wd is necessary

You're definitely looking at using more gas....figure maybe about 15 in town and up to 20 on the highway if you're lucky.

(Don't have one myself, but got figures from reading previous posts)