I just priced a 2003 4500 w/8.1 litter gas motor. The dealer had a 12' dump bed installed. I need some input if any of you have one of these trucks. 1st- after a 2500.00 rebate I can get the truck for 31500.00 is this a good price? Next would it be worth the extra money to purchase the diesel motor? The way gas and diesel prices are going up the diesel cost more money than the 87 oct., so fuel price is not going to be a factor. Is the diesel going to save me enough on fuel for the extra money up front? I know that the diesel is going to get a little better mileage, but in a big truck like this is it going to be all that much better?