Recommend you seriously consider the 3/4. My progression was 1/2T, 3/4T and now 1T. The 1/2T pulled our TT OK at the time, but the 3/4T handled it MUCH better. Of course that gave us the opportunity to upgrade...etc...same old story :)
Mileage on the 3/4 depends on the engine, if same as 1/2 you should get same mileage; but you might choose to get a more powerful engine and hence have poorer mileage. Repairs etc will cost more on the 3/4 because everything is beefier, my experience was that many parts (ie brakes) lasted longer too though.
