Totally agree, too, with those pointing out instrumentation, hypermiling, and tire pressure as having some of the greatest effects. Instrumentation is especially important for hypermiling because you have to monitor techniques like P&G with some precision to get them right.
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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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