:help: I have purchased an '02 Ram Truck w/ a small 4.7L engine. It seems to be stock, except for the dual exhaust, and 20" Ram wheels. I am getting an average mileage of 13.4mpg with fairly sedate driving. This seems to me at least 5mpg lower than it should be. What are you stock guys getting, how can I tell what the rear end gearing is, and if a previous owner put some "power" eprom chip in it?