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Not true, tires with a smaller diameter only have less contact area (resistance) if they are not inflated to a equal weight ratio pressure. Which if you were changing wheels is not something you would miss. In real driving enviroment the net efficiency of smaller lighter wheels is larger so as [P]hase says swapping for smaller wheels whether highway or not is still more efficient
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What is a[n] equal weight ratio pressure?
The paradigm is a tall,
narrow tire such that contact patch is equal, I don't know about the pressure.
The narrow tire will [or at least should] hydroplane less at simlar pressure.
Rubber and aluminum weigh about the same.