A couple days ago I reinstalled 3/4 of my lower block. The upper grille is always plexi-blocked. The day before, with no lower block, I parked at work with 182F water temp. With the block, in similar weather, I finished with 193F. How much that affects mpg is hard to say. Judging by my 30% lower winter mpgs, warmer MUST be better.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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