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Well when not towing or hauling anything the F150 will do much better than a 350. Now put a giant full height slide in camper in the bed and the economy is going to be dictated by the horsepower required to overcome that aerodynamic penality. I bet both gas motors make enough horsepower to do it and probably have equal thermal efficiency so they will get similar mpg. Compare the f150 diesel to a f350 diesel and again the thermal efficiency and power required will be similar so they will get similar mpg when working. When not working the f150 is just more efficient by a good margin. It's carefully tuned and sculpted to get the best possible mpg as it is epa rated. The f350 they don't really care as it doesn't get rated or effect CAFE average.
So you have to ask yourself how many miles will be working and how many not working. If it's mostly working get the f350 and you really won't be spending much more on gas, if 80% of the time you drive it back and forth to work without anything in it get the f150. Save gas and plus it's 5 times more comfortable.
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