What year models/engines are you comparing?

The 5.7 has always made 381 hp and 401 lbft torque. GM's 5.3 for much of the same time period made 275-355 hp and 320ish-383 torque. Also the 5.7 is a larger displacement engine and will produce a higher percentage of it peak power at comparable lower rpm's. Same holds true for the Ford 5.0 although im not that familiar with their specs. I also tend to believe some over inflate how easily the tundra does stuff and how hard others work etc. Ive diven tundras, they are good trucks but too thirsty for me when all the others will do the same job and return much better economy.

I didn't even get 18 mpg out of the 4.0 v-6 2wd single cab 6 speed tundra I drove.

I can only imagine which trucks he's actually been in.

The Tundra 5.7 has produced more power than the typical V8 offerings from Ford and GM. Ford and GM use smaller and more efficient engines than the Tundra. Also, you'll notice that it is the 3.73 gear set that is on par with the Toyota's 4.30, yet many Ford and GM trucks use 3.55 or higher gears, once again, for efficiency reasons. If you'll compare that 5.7 to a Ford EB with 3.55 or lower gears or a GM 6.2, you'll sing a completely different tune. And both will still get better mileage that the Tundra. That's not to say the Tundra doesn't still have some pros going for it when it comes to it's drivetrain. It is a less complex setup than either of those 2. (I'm thinking the 6.2 GM uses cylinder deactivation, but if not, it would be on par complexity-wise)

My new one is "thirsty"....but it's been awesome in front of my boat. No complaints. Whatsoever.

Except the air comes on in recirculate mode......every time.

It does that to draw the hot air out of the cab!

If the mechanics don't get my diesel issues sorted out, the Ram is going to be gone. I believe I have narrowed it down to either a Tundra or a GMC in the gas burner variety. I've bought my last Ford....

You thinking 5.3 or 6.2 GMC?

My dad's Tundra 5.7 is great, but it is thirsty. The new GMCs are awesome, and I think you can get some decent mpg.

You're going to miss that diesel.

Have you taken it to the dealer yet? I wouldn't kick the cummins to the curb over a set of injectors or a fuel pump. That truck will run for ever with good maintenance, your finally to the point where your getting your moneys worth out of it keep driving it. On that 6.7 maintenance shouldn't be that bad.