Got this email on saving Gas

gkatmar

New member
Don't no if it's true, but hope it helps.

Tips on gasoline that Dan Kaiser shared with his ND/SD team-thought you might be interested:

'New Gas Tips' (Every penny counts).

I don't know what you guys are paying for gasoline. Here in California we are also paying higher, up to $3.50 per gal. 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.

TIP #1: 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.

TIP #2: 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.

TIP #3: 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.

TIP #4: VERY IMPORTANT: 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.
 
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I thought most gas station's storage tanks were 8-10 feet underground (or more). I seriously doubt these tanks would warm up over the period of 6-10 hours. At this depth the ground temp does not vary significantly with day to day fluctuations. Temperature changes over long periods of time would be the only thing that would affect the temp of these tanks.

As far as #4... Yep yep yep! I found this out the hard way with my old vehicle. Ever since, if I see a tanker at the station, I avoid it for 24 hours.
 
#4 is the only one that makes sense. The others are all a bit silly IMO and will save you all of about two teaspoons of gas.

Tanks are well underground and under a thick pad of concrete. From my experience the temperature more than a few feet underground really doesn't change much, even on a hot day. It changes season to season but that's over the course of many weeks/months, not 12 hours. Try digging a 4-foot deep hole in summer... the soil down there is cool.

As for the evaporation, there are so many other factors to take into consideration not least being the air temperature, car temperature, humdity... I could go on. Basically you ain't gonna be able to prevent evaporation, and even trying to minimize it will save you a few pennies at most IMO.
 

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