Key questions: how many miles will you drive it annually ? Will you be towing on many steep grades ?
Mikes V10 example is a worst-case, they are known gas hogs. My 2000 7.4 K2500 does fine as a daily, but I don't drive in the city, or have cramped parking lots to deal with. I get 12.5 MPG combined, 13 Hwy, 10 towing. As mentioned, it handles grades fine, but you will be going slower than a diesel (I don't keep the pedal matted on a hill). The new gassers will get a few MPG more. The problem with the mileage argument, the $5,000+ premium for a diesel pays for lots of gas ! The payback is after 100,000 Miles or more. Yes, the engine will "last forever", but the rest of the truck falls apart at the same rate. diesel engine maintenance is a bit more expensive.
If the price isn't a deal breaker, test drive both and see how you feel ?
Edit: Don't know about newer trucks, but the 24 Gallon tank on my short bed does suck. Towing, you're looking for gas every 200 Miles !
'65 A-code coupe, T-10 4-speed, 8" 3.25 limited slip
Last edited by stephen_wilson; 04-14-2018 at 10:20 AM.