I'm thinking of buying a used 2 wheel drive Suburban, 1992 or newer, and would like to know if Chevy ever made a 6 cylinder version. I know it would be slow, but I would like to get decent gas milage. It would be a daily driver, kid hauler, family trips, no towing. What's the best Suburban combination for gas mileage? What can I expect in city and highway milage?