A friend of mine just sent the info below to me...
Not sure if this is true, but it seemed believable.


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.

 

"One of the most important tips is to fill up when your gas tank is HALF FULL."

That means i have to fill up every other time I drive the car! Or what about long road trips???

 

There is some truth to what has been said, possibly...but assuming that's true

How much of a fuel miser are you really going to get, I guess? The most you'd ever save with doing these techniques would be measured...maybe, maybe a dollar per fuel up? I can't really see anything significant about that.


If you want to make a real impact on saving gas, the real difference goes to what car you drive and DRIVING style. I know too many people who care about gas money, do all those fuel saving techniques, take out excessive weight in their car, and then when they start driving, they do the jack rabbit style where they pretty much just slam the accelerator to go, brake when they're not accelerating.

 

I could not agree more... the most interesting part to me was do not fill up while they are supplying fuel to the underground tanks.

 

uhh, on every single gas station here in ontario it says right on the meter "VOLUME CORRECTED TO 10C" right on the pump.

i call b.s.

 

Yeah, I've also heard that many gas stations have an internal temperature regulated control, so...it's hard to say whether it works or not.

 

"VOLUME CORRECTED TO 10C" is a standard, above or below this and volume changes

 

the minute differences in cost just do not warrant going through all the trouble. It seems if you drive to a gas station to get gas and do not because they are pumping, that negates any gains you might get from following these tips.

 

One borer shift and all that saved gas will go down the tubes.

 

the volume of gasoline you buy, is corrected, by the pump, to its volume at 10 degrees.

it explains this on the government of canada weights & measures act on the side of the pump (at least it does here in ontario)