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175/70R13 is what I have now, and there is a pretty good selection of tires for that size. The only 155/80R13 that I find is Khumo Solus KR21.
I guess changing the final drive is a better way to lower rpm on the highway than putting taller, heavier tires on.
I will have full skirts, front and rear, so not sure how much extra improvement moons would make if they are not in the airstream at all.
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