Thanks. None of those things describes my driving. 90% highway driving. Oil change at 5K intervals.Seems to be a driving style thing from my experience. Engine braking, extended oil change intervals, and lots of idling have been the 3 biggest factors I've noticed.
Diamond back is a nice cover ..did you go balls to the wall and purchase https://diamondbackcovers.com/products/diamondback-molle-panel-by-builtright ?'22 GMC AT4 Refresh, 6.2L runs awesome. 6.5' bed w/Diamondback cover on it now (not in pic)
21 tundra. Only bad thing has been some odd limp mode thing when I chainy the rear up. I had to chain up anyway to get to the next turnaround, so I kept going.2021 Tundra. Love everything about it...except for the milage...which I knew going in. 9-11 MPG while towing...but know plenty of people with other half tons that are in the same boat when towing. 14-16 MPG not towing, which is OK. I usually only ever drive the truck to pull our boat, which is 90% of the time. The rest of the time I drive my little 4 banger that gets 40 mpg.