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Thermal efficiency for an engine basically boils down to potential energy in (gas energy content) vs mechanical work output. 40% of the gas is converted to work. The prius engine in my car is 37%, a typical gas engine is more like 25%. Diesels are 40%+
The excess energy is the heat going into the engine, exhaust, the actual pumping effect of moving the air, etc.
I was going to mention that you can get white paint, but your profile pic looks like it's a nice car, so probably not really an option lol. My dad's done similar with an old buick he used to drive. He did it because the clear coat was already gone and the paint was starting to rust a little. It worked well enough for him, but it was a $200 beater car he fixed and drove to save it from the scrap yard.
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