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Perhaps going just 10mm wider will not add enough drag to be significant. I would wonder, however, about going to a 2in larger diameter wheel, as the wheels/tire package in such a setup would weight significantly more than what you have.
If had money to throw at a new set of tires and wheels, I might try going back to stock 175/75-14s, just to be able to compare MPG--but I would miss the extra grip in the corners.
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