> On 10/10/2006 22:09, Eric Hufstedler wrote:
> >> Hm. Interesting. I don't remember them changing that much. But
> >> a 10 deg. C change in temperature for 20 litres of gasoline
> >> increases the volume by almost 10%...? Wow. (Free gas!)
> >
> > Yep, that's why "they" say to buy gas in the morning, since the
> > pumps charge by volume, not weight.
> "They" also seem to forget that the gas is stored in underground
> tanks where the temperature is more or less constant. For the
> amount of time the gas is above ground where it can warm up, it
> won't warm up 10 degrees C.
1st, i'll say that i never buy gas based on time of day.
But to give "them" :) a little credit, there weren't predictions of 10 degree changes, and the underground tanks were mentioned. Still, there would be some change in temperature, and the optimum time was said to be morning, which was after the coolest air temperature.
For me it's academic: i don't like stopping for gas, so usu wait til it's pretty empty.
Eric
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