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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.
I used to believe fuel-cells would achieve commercial viability by 2015, but it was about 10 years ago. They're nice in theory, but Hydrogen is not so practical...