The rear window will leak in the 2021, the issue started in 2019 and GM has yet to address it. I have a window on order now with only 11k miles on it. It may or may not fix it. The rear spoiler above rear window is also poorly designed and allows water into the headliner. A lot of lifter issues in these trucks also. Knock on wood, I can deal with a leaky window, but not an engine rebuild.
My 2020 5.3 gets around 16-17 in city and 20 on highway.
I'll check out the new tundras when they come out, but I had to buy something last fall as my old truck had given me all it had...and I just got too good a deal on my sierra.
Only if it's a sliding rear window
