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A wider tire will produce more aero drag, and a heavier wheel will lose more in rotational mass. You want light, tall, narrow, and LRR... or the best combo of them all. How heavy are the 14" wheels versus the 15" wheels?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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