Check out Nansulate you can paint it on your house to insulate it, your car engine
parts to insulate them think intake to keep heat out, exhaust to keep heat in, the
floor boards to keep the interior cooler=less ac runtime which all could add up to
reduce fuel use. It is still a bit rich for my blood but if it could increase your mileage
and power and I saw some numbers from a trusted source, I might think about it.
Using it on the southern exposure here in Fla could reduce your Ac bill and that could
pay for it's self pretty quickly.