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Old 05-27-2011, 07:38 PM   #88 (permalink)
jedi_sol
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Join Date: Mar 2009
Location: Tustin, CA
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2013 STi *SOLD* - '13 Subaru Impreza WRX STi
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90 day: 26.59 mpg (US)

1996 Geo Metro *RETIRED from Ecomodding* - '96 Geo Metro Base
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Quote:
Originally Posted by Joenavy85 View Post
Just curious, why do you post the temps at time of fill up on your fuel logs?
When I first joined ecomodder, I just followed the assumption that you should "fill up when temps are cooler." So i've been keeping track on the temperature to see if there is a correlation mpg vs. temps vs. fillups.

But since you've asked, I've been doing research on this topic and I just learned that underground gas tanks do not flucuate in temperature very much. So i guess tracking temperature is a waste of time?

One question though. Since temps do not fluctuate very much for underground tanks, will temperature flucuations have a significant impact on the gas in my fuel tank, in terms of volume? Or are the changes so miniscule, it's not even a factor?

For example, assume i fill up when the outside temperature is 90*, the gas in my tank will have expanded a great deal, taking up more room in the fuel tank. Will that affect how much gas I can fill up? Would this cause underfill/overfill?
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