I have 35's on with a 3" leveling kit and they look small, but upgrading to 37's would probably call for more changes so I'll stick to 35's. Did think once about going to 33's for possibly mpg purpuses, but then I just thought they would look that much smaller. IMO I think you will be unsatisfied with the 33's. But like Stroker said it's your choice.
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