The 2021 and older Tundra’s didn’t get good mpg and in my opinion didn’t tow well either. It just wasn’t something Toyota focused on and Ford loved it. But the new (2022 and newer) Tundra’s get much better (avg 20 or better) since they basically have the F-150 Ecoboost engine. Not the same engine but same size and concept (twin turbo v6). You can no longer buy a Tundra with a v8. They’re all 6 cylinders now.