I had full caps for a while. Heat is not an issue. At the end of a drive in the Texas summer, I reached in and touched the brake rotors. They were barely even warm.
I now have some nearly smooth hubcaps that are more "normal" looking. They're plastic, so don't weigh very much.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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