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I have 14" stock wheels and just bought a set of 15" wheels. Both are wrapped with 195/60 tires for a 1" diameter increase which equates to a 4.1% decrease in RPMs. I get lug bolts Monday so I'm hoping that the larger size will give me a slight increase in fuel economy.
If you drive in your torque band then the size increase shouldn't cause any consequences except less fuel being used. Any larger of a tire and it will probably have a negative impact especially when outside the torque band. A narrower tire will give less resistance and a little better fuel efficiency which might come in handy with the larger wheel and tire size.
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