Quote:
Originally Posted by Joenavy85
Just curious, why do you post the temps at time of fill up on your fuel logs?
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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?