Gas/Petrol Octane

[billwot]

Originally Posted by paulca

You get more fuel if you fill on a cold day.

That's a myth. Fuel of course is stored in underground tanks, and the tank temps are essentially constant.

" Filling Up When It's Cold Outside

Get your gas in the evening or early morning - the fuel is cold, and therefore denser. The truth about this myth is that you can barely register a temperature difference, since gas is stored in cool underground tanks, so fill up when you want. There are no savings to be had by waiting until it's cool out."

http://www.investopedia.com/financia...ally-work.aspx

[phobos512]

Where I used to live in California we had VP Racing and they had 95 AKI and 102 AKI fuels on separate pumps. 95 was $4.99 and 102 was pushing $8/gal I believe...That was 2008 when I last paid attention to that stuff though, when I had my S/C'd GTO (Vauxhall Monaro for you Brits ).

[paulca]

Originally Posted by billwot

That's a myth. Fuel of course is stored in underground tanks, and the tank temps are essentially constant.

" Filling Up When It's Cold Outside

Get your gas in the evening or early morning - the fuel is cold, and therefore denser. The truth about this myth is that you can barely register a temperature difference, since gas is stored in cool underground tanks, so fill up when you want. There are no savings to be had by waiting until it's cool out."

http://www.investopedia.com/financia...ally-work.aspx

I should have added a smiley. It was part "tongue in cheek".

We are talking about few cubic inches a gallon for 20F degree shift.

Winter and summer, you might be able to measure it in some regions, but it's not going to make an impact on your fuel bill unless you can buy your summer fuel in winter and store it.

The gas industry apparently defines a gallon, a gallon at 60F.

In aviation when filling an airliner, you get your fuel in Kilos or Lbs because that matters and makes load sheets easy. Instruments are usually in Lbs per hour or Kilo per hour, because weight matters more than how full the wings are. However, the density and temperature of the fuel are noted when ordering and if beyond limits the fuel load adjusted. The fuel may get pretty damn cold at 40,000ft.

[hur1ey02]

Do warm climate areas (Cali and FL) switch to the winter blend fuels? Just curious.

[Wheelsoffracing]

I just paid $3.55 a gallon for 93 octane (Pilot) here in Virginia. Shell is always about $.10 to $.20 more a gallon than most of the others so Shell is $3.75 now for 93 octane.

[tahdizzle]

Originally Posted by hur1ey02

Do warm climate areas (Cali and FL) switch to the winter blend fuels? Just curious.

Yes we do.

Right now 91 oct is $4.39/gallon @ my local shell station.