I see MORE Tundras used where a lighter duty application will work. You are comparing apples to oranges. Toyota does not offer a heavy duty truck with a diesel engine. Comparing a gas engine F-250 with a Tundra is pretty much an even comparison. My money is on the Tundra to outlast, out pull, and out perform a gas F-250.
It never ceases to amaze me that the toyota guys feel the need to try to compare their "special" 1/2 ton truck to a 3/4 ton truck.
The toyota is in no way, shape or form equal to a gas or diesel powered 3/4 ton truck. To think so is ridiculous.