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The question as it appears in the 07/17 edition of Specs & Techs from GlobalSpec:
On January 12, 2007, I drove my car around a closed race course 100 times and measured the amount of fuel consumed. On June 12, 2007, I drove the same car around a closed race course 100 times and found that I consumed more gasoline. Why?
Thanks to MillMat who submitted the original question (which we revised a bit).
(Update: July 24, 8:24 AM) And the Answer is...
On the cold January day, the gasoline is colder and denser; therefore the fuel has more molecules (or more energy) per gallon than in the warmer weather.
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