The Grand Cherokee we bought a few years back was getting about 18 per gallon. It was a nice vehicle but with the wife driving it 70 miles round trip 5 days a week it was just ridiculous expensive especially when gas was close to $4 per gallon.
Our Honda is still getting over 25 per gallon with mostly city style driving. It's almost 10 years old, too.
Jeff- I watched the first Mad Max movie the other night and thought of you.