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Old 05-28-2011, 03:39 PM   #92 (permalink)
jedi_sol
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Location: Tustin, CA
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2013 STi *SOLD* - '13 Subaru Impreza WRX STi
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Quote:
Originally Posted by euromodder View Post
The expansion factor for gasoline is 0.00106 / °C.
If you heat 1 gallon of gas 20°C, it'll expand to 1.0212 gallon.
(Say 10° underground storage temperature vs. 30°C tank temperature.)

That's a 2% difference.


It's not dramatic, but it definitely affects the fill-up in warm weather.

The key factor is not what goes into the tank, but what fuel is still in there.

Filling up with a lot of expanded fuel still in the tank, would show a lower amount of fuel going in, and show artificially better mpg.
So assuming you still have gas inside your tank, filling up in cooler temps still applies. Maybe not so much as in "getting your moneys worth at the pump," but more in terms of getting accurate fillups when tracking mpg.
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