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I'd stick to a 215-45- 17 tire /wheel. The Michelins that come stock are solid for MPG. Find a nice forged 17" wheel (not too wide , I'm talking 17x7 or 17x7.5). Volk CE-28 comes to mind, they are about 13 lbs per wheel, 10-spoke design.
**Also no one had mentioned yet, but get some BRZ under panels for the aero gain, that will improve MPG... by how much, I'm not sure exactly.
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Math is like Love, simple idea at first that quickly gets complicated
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