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Old 06-09-2006, 05:38 PM   #1 (permalink)
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GAS density

I read somewhere that it is always better to fill gas either early morning or late evening... they say that at that time the density of gas is high (due to temperature) . Gas stations only measure volume not density of gas...

How true is this statement? If yes, how density of gas helps in effciency or performance of my car?

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Old 06-09-2006, 07:53 PM   #2 (permalink)
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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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Old 06-10-2006, 07:39 PM   #3 (permalink)
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yeah, around here it is corrected at 15C
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