Yes, understood. I still think the drop in rotational mass from the sparco's would more than offset that extra rolling resistance. I would think if anything you would pick up MPG with a factory sized tire.Not the guy who asked about the MPGs but I'm guessing because if you go to a wider wheel/tire, you gain traction but also a wider contact patch which increases rolling resistance.
To be fair, using the OEM tire on the Sparco Terra would only increase the contact patch by like 0.25" or so.
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