Pump Gas in the Morning

[L Rag]

Gasoline has a much higher coefficient of thermal expansion than water, which means that a gallon of gas at 0°C weighs more than a gallon at 20°C, since it has expanded with heat and gotten less dense. Underground storage tanks are fairly thermally insulated, so you really get more of an effect seasonally rather than across the day, but it's there. The gas currently sitting in the hose is fully susceptible to this effect, so ironically if you only fill up a little (to avoid vapors), you get a bigger effect from temperature in the afternoon to offset the savings. OTOH, it also means that pumping just a little at a time and only in the morning probably helps more.

Interesting? :jointsmile:

L Rag Reviewed by L Rag on 12-17-2007. Pump Gas in the Morning Interesting? :jointsmile: Rating: 5

[FakeBoobsRule]

You know I heard this several years ago and being in Florida this is important. Some news story reminded me about this the other day and I was going to post this but hey good job, you beat me to it. It is always best to buy your gas when it is the coldest time of the day as you get more.

[peacefrog14]

well that is good to know, and besides, that is when i buy gas the most.

[GixxerRidinToker]

I ride a bike and get 47+ mpg.. I'm not too worried about it myself... but good tidbit to be throw out there sir!

[MadSativa]

???? but the ground is about 65deg. F. in all parts of the world. at least about 6 feet under or more where the petro tanks are. If anything their would be more mositure in the lines of the pump in the morning.

[LIP]

I'm glad i run on diesel - and i dont even have to pay for it!

[MadSativa]

You use bio LIP?

[LIP]

Nah, i run my car and vans on marine diesel [33p a litre or around that mark] and i dont pay for it. We've got our own underground tanks at the boatyard i work. Compared to a boats fuel tank, im hardly using any of it!

But i dont think i'll be able to do it for much longer coz customs have caught on [almost ALL the boatyards in the area use marine diesel for the vans] so customs want to start dying marine diesel white. Much like agricultural diesel is dyed red.

The only differnce between normal city diesel and marine is the slight differnce in viscosity and colour [and tax]

I have made my own bio diesel before though, but it's too much hassel lol! I'm too lazy!

[MadSativa]

^^ I wana make a lot of biodeisel at once but getting Waste vegitable oile here is a hassel

[LIP]

Is it? We've got TONS of the stuff over here! The amount of fish and chip shops is very high - so with that goes alot of used oil!

We should ship it over - a new export!