Going to try for a new tow vehicle

Ok just a couple comments.
If the owners manual recommends higher grade gas.......when you are working the truck, it will perform better if you do!

What did you do with that high compression eng you build and would detonate on hot days......you turn your distributor back until it stopped. at light throttle it ran the same but you noticed the power lose when you worked it.
Same thing is happening here........only the computer notes the detonation before you do and drops the timing.

IF you pull in a hill/mountain range or your truck only leave the yard when it has a load to pull..........
You will make up the price difference in mileage and longevity with a diesel.

And lets get real here. That diesel won't slow down going up that hill and most of us wont take it easy on the equipment if it can and will pull that steep up hill grade, at or above the speed limit.

And your gasser truck you wont either. You will gear down until the eng revved to pull that grade.

The difference?
You will be pulling your load 20+ mph faster and getting double the mileage going up that hill.