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How to Save a Little Money on Gasoline #1030996 07/01/11 01:59 AM
Joined: Feb 2004
Posts: 10,238
FrankR Offline OP
Web Wheeler
****
This was sent to me today by Hyundai - I thought it was interesting:

Quote
Here are a few insider tips to help you save money at the gas pumps.

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 when 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.

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 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.

3. 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.

4. 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. To have an impact, we need to reach literally millions of gas buyers. It's really simple to do.


Frank


'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: How to Save a Little Money on Gasoline [Re: FrankR] #1030997 07/01/11 02:41 AM
Joined: Jun 2002
Posts: 6,208
JohnnyBfromPeoria Offline
Trail Leader
*****
Tanks are buried underground. The temperature of the fuel inside those tanks varies very little with above ground temps throughout the day. I'm calling shenanigans on point #1.

John B.

Re: How to Save a Little Money on Gasoline [Re: JohnnyBfromPeoria] #1030998 07/01/11 03:14 AM
Joined: Apr 2006
Posts: 1,193
mxmikie Offline
Body Damage is Cool
i just drive my chevrolet turbo sprint ......68 mpg <img src="/forums/images/graemlins/wink.gif" alt="" /> <img src="/forums/images/graemlins/wink.gif" alt="" /> <img src="/forums/images/graemlins/wink.gif" alt="" /> <img src="/forums/images/graemlins/wink.gif" alt="" />


it dosent have to be surrounded by water to be an island
Re: How to Save a Little Money on Gasoline [Re: FrankR] #1030999 07/01/11 03:23 AM
Joined: Jan 2000
Posts: 16,227
off-roader Offline
Web Wheeler
*****
Quote
This was sent to me today by Hyundai - I thought it was interesting:

Quote
Here are a few insider tips to help you save money at the gas pumps.

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 when 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.

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 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.

3. 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.

4. 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. To have an impact, we need to reach literally millions of gas buyers. It's really simple to do.


Frank


I've read that #1 is not correct. The temp is VERY stable because it is underground.

Ive also read that #2 is a good idea to do.

Not sure about #3 though. Perhaps it's true but likely the difference is negligible.

Yes to #4.

Also, the quickest adjustment you can make to improve gas mileage is to adjust the nut behind the wheel. <img src="/forums/images/graemlins/lol.gif" alt="" />. You laugh but it's almost always the truth... Unless you're a hypermiler.

Re: How to Save a Little Money on Gasoline [Re: JohnnyBfromPeoria] #1031000 07/01/11 03:26 AM
Joined: Feb 2005
Posts: 1,511
ryany Offline
Body Damage is Cool
I have an issue with point #2, filling up when you reach 1/2 tank - I think the gas mileage penalty due to the extra weight of the additional fuel that you're carrying around would easily outweigh the loss of gas due to evaporation during filling. That weight isn't much on most cars but 1/2 of my tank is 10-11 gallons, which is over 60 pounds of extra weight to carry.

On the other hand, I do agree that you shouldn't let your tank go below 1/4 - the fuel pump is cooled by it's immersion in fuel and running the tank almost empty could potentially shorten the life of your fuel pump due to the increased operating temperature.


95 Montero SR
3.8 MIVEC, Advance headers, 2 1/2" exhaust, Magnaflow muffler, OME shocks & rear springs, 2" body lift, 3" tank lift, 4.90s, TRE front locker, factory rear locker, Roger Brown Rock Sliderz, 315/75r16 (35") tires, Sport big brakes
Re: How to Save a Little Money on Gasoline [Re: off-roader] #1031001 07/01/11 03:27 AM
Joined: Jun 2002
Posts: 6,208
JohnnyBfromPeoria Offline
Trail Leader
*****
Hypermiler = nut behind the wheel.

John B.

Re: How to Save a Little Money on Gasoline [Re: off-roader] #1031002 07/01/11 03:30 AM
Joined: May 2000
Posts: 6,132
K
Kevin C Offline
Trail Leader
****
#3 is false as well.


87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...
Re: How to Save a Little Money on Gasoline [Re: ryany] #1031003 07/01/11 03:33 AM
Joined: Jun 2002
Posts: 6,208
JohnnyBfromPeoria Offline
Trail Leader
*****
Ryan, the extra weight isn't as critical as you might think, but I'll let others debate that.

I had(had being the key word) a GF who would never, ever keep gas in any vehicle, even after I would fill it up. Drove me nuts. I gave her the ol' 'fuel keeps the fuel pump cool' suggestion as well as the 'just put that $5 in at the end of every day to keep it full,' but it just didn't sink in.

I've got a much smarter GF now.

John B.

Re: How to Save a Little Money on Gasoline [Re: JohnnyBfromPeoria] #1031004 07/01/11 03:53 AM
Joined: Jan 2000
Posts: 8,160
Lloyd Swartz Offline
Web Wheeler
Mythbusters and Consumer Reports have tried damned near everything lately, and the only thing of any significance was driving style. Using cruise, excellerating slow, not driving angry, ect, ect. Even conventional wisdom like tire inflation made little difference. So I would not buy into any of that hocus pocus. If you have an off-road rig, either empty your wallet or drive something else <img src="/forums/images/graemlins/lol.gif" alt="" /> Not slamming that ledge with open diffs for a 1/2 hour wouldnt hurt either.(you know who I am talking about) <img src="/forums/images/graemlins/shame.gif" alt="" />


1996 SR From the Area 51 Skunk Works. 37"BFG Tires, 5" lift, Rock Track 4:1 Case, Tom Woods Drive Shafts, Oasis Air, Front ARB, lifted gas tank, T-max winch and lots of stuff that cost too much.
Re: How to Save a Little Money on Gasoline [Re: Lloyd Swartz] #1031005 07/01/11 03:56 AM
Joined: Jun 2002
Posts: 6,208
JohnnyBfromPeoria Offline
Trail Leader
*****
Hey...gas was cheap then, Lloyd!

John B.

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