Got this email from a co-worker- Interesting information.

Note: I didn't write this, so some if it may not be true.
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TIPS ON PUMPING GAS

I don't know what you guys are paying for gasoline.... but here in California we are also paying higher, up to $3.50 per gallon. But my line of work is in petroleum for about 31 years now, so here are some tricks to get more of your money's worth for every gallon.[/align][/align]Here at the Kinder Morgan Pipeline where I work in San Jose , CA we deliver about 4 million gallons in a 24-hour period thru the pipeline. One day is diesel the next day is jet fuel, and gasoline, regular and premium grades. We have 34-storage tanks here with a total capacity of 16,800,000 gallons.[/align][/align]Only buy or fill up your car or truck in the early morning when the ground temperature is still cold. Remember that all service stations have their storage tanks buried below ground. The colder the ground the more dense the gasoline, when it gets warmer gasoline expands, so buying in the afternoon or in the evening....your gallon is not exactly a gallon. In the petroleum business, the specific gravity and the temperature of the gasoline, diesel and jet fuel, ethanol and other petroleum products plays an important role.[/align][/align]A 1-degree rise in temperature is a big deal for this business. But the service stations do not have temperature compensation at the pumps.[/align]
When you're filling up do not squeeze the trigger of the nozzle to a fast mode. If you look you will see that the trigger has three (3)stages: low, middle, and high. In slow mode you should be pumping on low speed, thereby minimizing the vapors that are created while you are pumping. All hoses at the pump have a vapor return. If you are pumping on the fast rate, some other liquid that goes to your tank becomes vapor. Those vapors are being sucked up and back into the underground storage tank so you're getting less worth for your money.

One of the most important tips is to fill up when your gas tank is HALF FULL or HALF EMPTY. The reason for this is, the more gas you have in your tank the less air occupying its empty space. Gasoline evaporates faster than you can imagine. Gasoline storage tanks have an internal floating roof. This roof serves as zero clearance between the gas and the atmosphere, so it minimizes the evaporation. Unlike service stations, here where I work, every truck that we load is temperature compensated so that every gallon is actually the exact amount.

Another reminder, if there is a gasoline truck pumping into the storage tanks when you stop to buy gas, DO NOT fill upmost likely the gasoline is being stirred up as the gas is being delivered, and you might pick up some of the dirt that normally settles on the bottom. Hope this will help you get the most value for your money.

WHERE TO BUY USA GAS, THIS IS VERY IMPORTANT TO KNOW. READ ON

Gas rationing in the 80's worked even though we grumbled about it. It might even be good for us! The Saudis are boycotting American goods. We should return the favor.

An interesting thought is to boycott their GAS.

Every time you fill up the car, you can avoid putting more money into the coffers of Saudi Arabia. Just buy from gas companies that don't import their oil from the Saudis.

Nothing is more frustrating than the feeling that every time I fill-up the tank, I am sending my money to people who are trying to kill me, my family, and my friends.

I thought it might be interesting for you to know which oil companies are the best to buy gas from and which major companies import Middle Eastern oil.

These companies import Middle Eastern oil:

Shell........................... 205,742,000 barrels

Chevron/Texaco......... 144,332,000 barrels

Exxon /Mobil............... 130,082,000 barrels

Marathon/Speedway... 117,740,000 barrels

Amoco.............................62,231,000 barrels

Citgo gas is from South America, from a Dictator who hates Americans. If you do the math at $30/barrel, these imports amount to over $18 BILLION! (oil is now $90 - $100 a barrel

Here are some large companies that do not import Middle Eastern oil:

Sunoco..................0 barrels

Conoco...................0 barrels

Sinclair.................0 barrels
[/align]B P/Phillips............0 barrels

Hess.......................0 barrels
[/align]ARC0.....................0 barrels

If you go to Sunoco.com, you will get a list of the station locations near you.

All of this information is available from the Department of Energy and each is required to state where they get their oil and how much they are importing.[/align]

 

Could someone explain a little more clearly the "Only fill up when you have half a tank" rule? I don't get it.

 

Basically when you have half a tank and fill up there is less room (free space) in the tank for the fuel to evaporate. If more fuel evaporates, you get less gas.

If you aren't fimiliar with evaporation, it's the change from the liquid state to the gas state. This happens when you boil water.

Your gas cap is designed to not let the fumes escape. Ever open your gas cap to fill up when you have really low gas and hear that little pssssssh?

Hope that explains better.

 

the half a tank rule is b.s, he says that if your at half your gas evaporates and it stays in the tank but when its at full it disapears. this is b.s because the epa has tests that say that gas evaporating is worse than a car running cat free. but gas evaporates even when youre car is not running. the epa put in rules that all autombiles have to have systems in place for gas leaks. the system has sensors in place that run 24/7 that check vapor preasure etc and if theyre is too much vapor the vapor is sent to a charcoal canister once enough vapors absorb it becomes a liquid again. he is correct on it if we were talking about very old cars

 

So basically fill up more before the tank gets low?
I have about half tank now and i plan to fill up friday
and ill go 10-15 miles before then lol

 

I just want to say again that this is not my info - it's just a email i recieved. My explanation of the gas rule was just by looking @ what i posted & a little scientific knowledge

 

Good job. If this email has correct info, then by god I'd do it.

 

Thanks for posting rmt99r.

Years ago, I had read that a typical automobile gets better gas mileage when the tank is closer to empty because of the weight savings of less gasoline. It would be interesting in practice if either situation offsets the other, or is this just irrational conjecture.

 

I heard that the more gas you have in your tank, the longer it'll last because of less air allowed inside the tank. Idk. I just heard that.

 

[quote]Ever open your gas cap to fill up when you have really low gas and hear that little pssssssh?[/img]


EVAP pressurizies your fuel system and checks leakdown pressure regularly. I'm currently throwing a code 'EVAP system, small leak detected'. the pssssh is that, not evaporated gas....

Also, if you go more than 2 feet or so below ground, the temperature is going to be pretty stabilized, probably around low to mid 50's Fahrenheit. Don't believe me, step into a cave, or research 'geothermal gradient'. The morning/evening thing is BS.

I think your source got lucky with the fuel truck thing. That is true. If you wanna get in-depth about your gassing procedures, keep track of when deliveries are made. Fill up a couple days later once the crap has settled.

There's a bit more on this in 'Forced Induction - Performance Tuning' by A. Graham Bell. Maybe I'll look it up later.