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The OEM tires are low rolling resistance, which saves any car a bit of mileage. Trouble is, good luck finding any manufacturer who will outright tell you that a tire is LRR. I have yet to see any success stories with alternative tires, especially for driving outside of Winter.
Doesn't an exhaust replacement remove the emission controls? I thought the exhaust and air mods were not street legal.
Adding any electrical load would have the same effect as it does on alternators, except that the hybrid doesn't have an alternator. Can't get something for nothing.
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