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I am stuck at a 68 mpg average despite quite aggressive hypermiling. The freeway is rough on my average every time. This was my problem last summer, too. My flat decklid spoiler, when I had the prototype on the car, seemed to help significantly (1-3 mpg), but I have not finished this summer's build.
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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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