I'm thinking about picking up a late 90's Cummins for a possible plow truck and/or tow rig. I was wondering what sort of mileage I could expect to get with a stock extended cab automatic. I just mean during normal driving, btw, not plowing or towing. Thanks for any info. edit: Maybe I should have read page 2 before posting this. I can't believe some of you guys are getting 20 and over. That's just insane with a truck that big. I've GOT to get me one. Fell free to still post your mileage though.