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I think you'd need only 10 or 15 hp for 55 or 60 mph freeway cruise on level ground, but climbing any hill at freeway speed would probably ask for more than the 30hp you're considering, unless you don't mind slowing a lot. I think that's true.
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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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