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optimally what you want is a lighter, narower tire rim combination. by going to a larger rim and lower profile tire (assuming the actual OD (outer diameter) remains the same) you achieve better handling due to less side wall flex, now if we also assume that in this process you switch to a narrower tire (from a 195/xx/15 to a 175/xx/15) you will effectively reduce the amount of surface area touching the ground thus reducing rolling resistance.
basicly, what i am saying is
1) you want the lightest possible tire/wheel combination
2) you want the narrowest tire you can get
3)bigger isnt always better, but then again it is not always worse.
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