Posted on 03/07/2008 6:33:13 AM PST by CGASMIA68
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 temperature is a big deal for this business. But the service stations donot 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.
Dont for get(my add on) hold the hose up to get what the meter read but didnt make it to the tank...I thing you get what the guy before didnt get?
Forgot..snopes is still out on this one
Not driving like a possessed demon will save you ten times as much gas.
Best tip is to drain the gas left in the hose.
The moisture issue is a non-starter.
That and proper inflation of yer tyers do more than all of these.
The fact that the guy who wrote this thinks that gasoline temperature in an underground tank fluctuates from morning until noon indicates that he is an idiot, no need to read further.
However, you might consider filling up right after the tanker comes by on really cold days before the gas warms to ground temperature. This might save you, say, 5 cents in your lifetime.
1. Only buy or fill up your car or truck in the early morning when the ground temperature is still cold......TRUE
2. When you’re filling up do not squeeze the trigger of the nozzle to a fast mode.........TRUE, but hardly a big difference.
3. One of the most important tips is to fill up when your gas tank is HALF FULL.......TRUE, but again, hardly a big difference.
4. If there is a gasoline truck pumping into the storage tanks when you stop to buy gas, DO NOT fill up.......TRUE........especially for fuel injector engines and especially DIESEL. But I’d be more worried about an explosion from a passing cigarette...........
I “Dollar Cost Average” my gasoline, which means I tank up on the same day each week, no matter what the level of gasoline is in my tank.
That way, I’m paying an “averaged” price each month and it doesn’t break the budget.
I do the same with investing. Each month I invest x-amount of dollars, but over the course of time, I’m paying an averaged cost on those stocks. Some months it’s higher, bust most months it’s lower or a wash, so I get more shares for my dollar over the long haul.
‘Tain’t Rocket Science. Don’t buy into the “we’re running out of gas” pap from fear-mongers. We aren’t.
“This might save you, say, 5 cents in your lifetime.”
ROFLMAO! :)
I have a feeling all of these cases would equate to 1/100th of a percent difference.
These tips may have made sense in 1973, they don’t apply now.
1. Tanks are insulated. They stay within a few degrees of the temperature the fuel was delivered at. I.E. Hot gas in the ground tank stays hot.
2. Nozzles these days must deliver the proper amount and they do reclaim fumes. That said how much more fumes are created between slow and fast? I’d bet it’s a whole pennies worth. It’s not worth the extra five minutes you’re going to spend at the gas station.
3. The bit about fuel evaporating because your tank is half full is bunk. All vehicles built in the past 20 years have sealed fuel systems. No fuel is lost to evaporation. The reason storage tanks have a floating lid is that gasoline fumes are extremely flammable, by having the floating lid, they minimize explosion risk.
4. Getting gas while it’s being filled is not harmful. All fuel pumps have filters on them. They look like your car filter and they will stop any contaminant from getting into your tank. Do you think any gas station wants to pay for repairs on cars they just fouled up? Ever heard of it happening?
The ground temperature doesn’t vary much between morning and afternoon.
On the temperature part... the volumetric coefficient of thermal expansion for gasoline is about 1 part per thousand per degree Celsius (950*10^-6 for the nerds among us).
So... a 20 degree Fahrenheit change in ground temperature is about 11 degrees Celsius. And 11 parts per thousand on $3 gasoline saves you about 3.3 cents per gallon. That’s not a major savings but its not zero either.
3 * (989 / 1 000) = 2.96700
Bogus nonsense.
And clean filters and regular oil changes.
I thought the main reason the tanks are buried is because the temperature underground is stable? The only thing I can see that might be affected by temperature would be the pump itself.
Modern cars have a sealed vapor recovery system, the car burns the vapors. So I can’t see tank level having any affect either.
Much ado about nothing.
Grit your teeth, fill up and forget it.
It is all part of the American dream :)
I am so lucky now.. I have a bus that takes me anywhere I want to go in this city, and anytime I want before midnight, and I pay only the same as $20 per month.. Eat your heart out.
Whoever wrote this is full of the stupids.Ground temperature is very steady, and so is the fuel in the tank.
Waste of time to read further.
He said a jet aircraft (retired from airline) could be sitting on the tarmac, you could fill to full with fuel and after a length of time in hot temp., jet fuel would start pouring out.
I also received this email. One thing I don’t do, but I probably should, is keep a lot of gas in my tank. One of the things that pi**ed me off when my brand new Honda Prelude was stolen was that the thief had a full tank of gas on top of my new car. Out of fear, I keep about 1/4 to 1/2 tank of gas at all times.
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