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Lots of good responses. Do the 3.45... it's maybe an 8% reduction in RPMs at speed. Also, what size rims/tires are you runnig and how heavy are they? Taller and if possible lighter tire/rim combos will also bring down RPMs on the freeway without a rotational mass hit.
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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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