From fuelly the Tundra from 2015-2020 with the 5.7 V8 avg is 13.9 mpg, The F150 3.5 ecoboost is 16.1, the Silverado 1500 with the 5.3 is 16.2. A 2.2-2.3 mpg spread might not sound like much but it's around 15%, that's significant and adds up over time. I used the 3.5 ecoboost for the Ford because that's the closest equivalent to the 5.7 even though it's a V6. The difference in my opinion is mostly explained by direct injection in the Ford and Chevy engines, the Toyota isn't direct injected.
That's exactly my point. I wouldn't let 2 MPG difference influence my decision on a vehicle. Does it add up? Yes. Would it sway me to buy one brand over another? Probably not. It would depend on other factors.
The broader point is that they all suck for fuel mileage, compared to an econobox. Pretty dang similar is the point.
At least we aren't discussing outlier examples of 20+ MPG from Ford, RAM, or GM
They all get similar fuel mileage. Which is not what I usually hear from many people complaining about the Tundra.
If 1 or 2 MPG breaks the bank, then that is another issue.