Since October 2007, there has been an email circulating with subject line that reads something like 'PETROL TIPS - great info!!' or 'Tips on Pumping Gas'. Click here to go to www.snopes.com for more info.
Snopes has classified the information as neither true nor false - hence 'mixture'.
Anyhow, here's an example of content of the email that I recently received:
PETROL TIPS - great info!!
With Petrol expected to reach $2 per litre by end of 2011, these tips that I received from a friend might come in handy.
TIPS ON PUMPING PETROL
I don't know what you guys are paying for Petrololine.... but here in Melbourne we are paying up to $1.30 to $1.50 per litre. 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 Litre:
Here at the Shell Pipeline where I work in Melbourne, we deliver about 4 million litres in a 24-hour period thru the pipeline.... One day is diesel the next day is jet fuel, and Petrololine, regular and premium grades. We have 34-storage tanks here with a total capacity of 16,800,000 Litres.
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 Petrololine, when it gets warmer Petrololine 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 Petrololine, 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. 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.
One of the most important tips is to fill up when your Petrol tank is HALF FULL. The reason for this is the more Petrol you have in your tank the less air occupying its empty space. Petrololine evaporates faster than you can imagine. Petrololine storage tanks have an internal floating roof. This roof serves as zero clearance between the Petrol 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 litre is actually the exact amount.
Another reminder, if there is a Petrololine truck pumping into the storage tanks when you stop to buy Petrol, DO NOT fill up; most likely the Petrololine is being stirred up as the Petrol 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 Petrol buyers. It's really simple to do.
I'm sending this note to about thirty people. If each of you send it to at least ten more (30 x 10 = 300)... and those 300 send it to at least ten more (300 x 10 = 3,000) and so on, by the time the message reaches the sixth generation of people, we will have reached over THREE MILLION consumers!!!!!!! If those three million get excited and pass this on to ten friends each, then 30 million people will have been contacted!
If It goes one level further, you guessed it..... THREE HUNDRED MILLION PEOPLE!!!
Again, all you have to do is send this to 10 people. How long would it take?
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