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I have tires that are 1 inch increased diameter, it throws the speedo off about 5%. The effect is less than 300 RPM change, I figured it out before but forgot exactly how much. I don't really know much about the first gen Prius transmission. Planatary gear? Sounds similar to a CVT, the computer is always trying to optimize the gear ratio for the situation. Anyway, since you don't have a fixed ratio I doubt increased diameter will help.
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