There is a definite leveling off of any gains past about 80 degrees. I don't use AC, so that's not the reason. I'm guessing 80-90 is the optimum intake temperature for my car.
I have very little data at the cold end, as you can see, so that's somewhat suspect. Most of this winter's points were on the high end there, while last winter had the low points. I think early results skewed the data. That, or just unfamiliarity with winter driving for mileage.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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