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Old 07-20-2008, 08:47 AM   #3 (permalink)
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Location: Irons, Michigan
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Workride - '07 Chevrolet Aveo5 SVE
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It makes sense, except gas is stored in tanks set below the frost line. Below the frost line the ground stays the same temperature the year around. So I assume that means it stays the same temperature throughout the day. Hence, no temperature change and no desnsity advantage. Years ago I had to maintain a 5000 gallon below ground gas tank on company property. The only time I ever saw any flucuation was when there was a withdrawal (maybe 3 a week). I measured that tank all hours of the day and never saw any daily variation. If there had been any variation I would have had to report it, never did, and that was up to 5000 gallons, a much large amount then you would ever get in a vehicle's tank. Now above ground tanks are a whole different thing. Another factor would be when they get the delivery which would be a different temp than was in the tank.

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