Kudos on such a good looking and working build! I think the wheels, the front arms connecting them to the body, and their lackof fairings mean the Cd your people calculated is probably optimistic. Looking for fairings for those wheels and arms is definitely one of the key places to improve that disappointing 69mpg you just recorded. Right now those tires and wspoked wheels are giant spinning mess-fans mucking up your aerobody's pretty nice shape.
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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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