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Gas is stored in under ground tanks. Daytime temperatures make very little difference in the density of fuel stored there, as the temps are pretty stable under ground. You might get a little difference in the first gallon, but after that it's back to normal. As a test, notice that on a hot day the pump handle is cool?
Fuel around here is also priced with a temperature correction factor. I remember they had little sensors in the pump to make that adjustment. Believe me, the gas companies aren't giving it away, no matter how little difference it makes.
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