What are you going to use your vehicle for? A few years back I was looking for a tow vehicle to pull our Airstream travel trailer. After much research I chose a full size GMC 3500 (1 ton) cargo van. The hardest part was finding a dealer that would order what I wanted. The catch was I wanted a big block 454 cu motor with special gearing. No dealer would stock such a truck as most people think these get lousy gas miliage. WRONG! I kept track of the milage the first year and then quit as it does not change much. In town not trying to get good milage it gets 12 mpg. Not what I bought the van for. At 78 mph not towing it gets 16 mpg. At 55 mph I don't know as I have never checked it. At 55 towing a 7200 lb. 31 foot Airstream trailer It gets 14+ mpg. This is why I bought the big block motor. People I know that have similar vans with the smaller engines get 8 to 10 mpg towing on a good day. Other advantages of the 1 ton truck. 95,000 miles on a set of tires. Burns regular gas. Still has the orginal brakes at 114,000 miles. Lately I have been trying to get better milage out of this truck and will post results as I get them.