I wish I had double-checked cbaber's citation of the EPA estimate, as Cd did above, but cbaber knows what he's doing and I felt lazy. Since it should be performing better than 29 and by quite a lot, given how you drive, I think the questions about mechanical repair are obviously more important than I realized. It is still good advice, however, to work on technique.
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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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