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Got this from another board I sponsor Camaro5, though it might help
Originally Posted by Jeanius
Got this email from a good friend of mine, thought it might be worth sharing.
TIPS ON PUMPING GAS
*I don't know what you folks are paying for gasoline.... but here in California we are paying up to $3.75 to $4.10 per gallon. 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:
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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.
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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.
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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.
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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. You should be pumping on low mode, 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 of the 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.
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One of the most important tips is to fill up when your gas tank is HALF FULL. 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.
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*Another reminder, if there is a gasoline truck pumping into the storage tanks when you stop to buy gas, DO NOT fill up; most 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.
*To have an impact, we need to reach literally millions of gas buyers. It's really simple to do.
"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. "
Yeah,I'm pretty sure that 10,000 gallons of gas,buried 10 or 15 feet underground changes temperature instantly to coincide with the ambient temp at the pump-so if I'm freezing my azz off while I'm getting gas,I must be saving big bucks.....
The savings,if any at all, would be so small as to be a mute point.
I probably waste more gas up the on ramp in the morning having fun than I could save. bottom line is there is always some cents to be saved somewhere, reality is most of us don't care.
Yeah,I'm pretty sure that 10,000 gallons of gas,buried 10 or 15 feet underground changes temperature instantly to coincide with the ambient temp at the pump-so if I'm freezing my azz off while I'm getting gas,I must be saving big bucks.....
I'll just short shift a few more times if I want to save gas...
Just got back from filling the Suburban in Chicago area. It is warm today compared to the cold of winter. The fuel is ice cold in the ground right now in this area. The metal pump handle was dripping from the condensation from the cold fuel passing through.