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When sitting still, heat rejection would mean alot, I guess. But once the car is rolling the aflow of air over the car will cool the roof regardless of color. The benefit of paint therefore is minimal. On your camper, tho... well you hang out in that more often with it stationary, so... makes more sense there.
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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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