I would bet that when they say "significantly lower rolling resistance" they only mean relative to other sport performance tires. I think you are right on that. Buy 'em anyway and experiment. You need grip on those front wheels or the fun of the engine swap is defeated.
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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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