[MetroMPG]

I think light colours' main advantage on cars would be reduced A/C use more than anything else. Interesting thought though.

If we were going to take a page from aircraft building, we wouldn't paint the cars at all - to save weight!

OT: I recently saw a program about a large, water jet-drive catamaran built in Australia, and if I recall correctly they saved thousands of pounds by not painting everything. (Yes, I realize cars aren't as big as ferry boats.)