I am going to be buying a used 1500 or 2500 in the next week or so and I can't seem to find much info on mpg. I know the 1500 gets around 16-17 (5.3 Z71 4x4) in a 50-50 mix of country roads and towns because I rented one and put 800 miles on it, but what does the 2500 get? FYI- I'm looking at 2001-2005 4x4's, would love a manual but all I can find is autos. Any numers on mileage would be appriciated. Thanks