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Found in another forum.

TIPS ON PUMPING GAS (Good information) 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.
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.
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. 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. 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 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. 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.
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. Hope this will help you get the most
value for your money. DO SHARE THESE TIPS WITH OTHERS!

BADs Crew wrote:Found in another forum.

TIPS ON PUMPING GAS (Good information) 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.
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.
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. 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. 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 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. 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.
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. Hope this will help you get the most
value for your money. DO SHARE THESE TIPS WITH OTHERS!

All of that seems second nature, aka the words you said are all things I already knew except the flow-rate at which you pump. Didn't know there was a vapor vacuum effect. I remember being in the 2nd grade and we had a Sub Teacher that had a "cheap husband" and I remember learning about gas expanding in the heat and that filling in the cold whether squeezes every penny into your tank from the pump, thanks for the tips! and thanks for taking the time to post it.. Interesting to know

Load of crud! Why do you think the tanks are underground? To maintain an even temperature. Ever measure soil temps below 3'? No way you can heat or cool the top 3' enough to make a difference.
Vapors being sucked back to the storage, WTF. Like that is going to amount to squat.

Same as most of these chain mail topics. Just enough fact to make you think it is true.

BTW. I can boast my expertise too. 1992-1998 I was a UST decommision and installation supervisor as well as soil matrix clean up and disposal. I still hold my licenses.

RIGHT ON !!! Brule,

HenryJ wrote:Load of crud! Why do you think the tanks are underground? To maintain an even temperature. Ever measure soil temps below 3'? No way you can heat or cool the top 3' enough to make a difference.
Vapors being sucked back to the storage, WTF. Like that is going to amount to squat.

Same as most of these chain mail topics. Just enough fact to make you think it is true.

BTW. I can boast my expertise too. 1992-1998 I was a UST decommision and installation supervisor as well as soil matrix clean up and disposal. I still hold my licenses.

Boy, that was like poking a lion with a stick.

The internet is a wonderful tool to spread knowledge. Too bad there is no one checking the facts.
It doesn't take long before a silly bit is taken as fact. People are sheep and tend to follow. Lead them off a cliff and they fall.
I really hope the dumbing of our society has those that will stand up and say, "Wait a minute. Lets think about this. Is this something I really want to follow? Do I want to follow those and lead others down the same path?"
Legends and rumors become fact in ways much like this and some college kid gets to say, "I started that one!"

The joke is on you.

Ok, how about who pioneered chilling fuel for race cars? No Google here, I am going from memory. Two hints.......

Can AM and rental trucks

You know me. I had to Google "chilling fuel for race cars"

Find a gas station that uses above ground storage tanks for the winter
NHRA banned the cool cans. The problem was the water from melted ice being spilled on the track. Expansion tanks for the cooling systems must be dry as well.
The concept of cold fuel being denser is sound , as are the performance gains. The fuel at the pump is not going to vary in temperature enough to make a minuscule difference. The system is under ground and insulated from the outside temperatures. Gasoline is just not that sensitive to minor changes in atmospheric temperature.

no cigar