I've got my eye on a 2003 Quad Cab 4x4 2500 with a manual transmission. It has 107,000 miles on it. I'm mechanically ignorant so what are some things I need to look for. Also, just curious as to what kind of fuel mileage I might expect. I've read all kinds of numbers from 17 up to 24 and am curious as to what actual owners are getting. Anyway, thanks for any help.