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Old 09-05-2013, 02:10 PM   #1
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Fuel facts. CHECK THIS OUT.

Ok here is some great fuel facts people should know so they make the right decision in buying fuel at the pump.

First off I work in the oil industry. I deliver fuel to stations and I have studied and have had classes on the making of gasoline and diesel at the oil terminals where we buy the fuel. So here it goes.

Gasoline is sent down the pipeline from the oil rigs all through the country in the form of no ethanol and only in two ratings. 87 and 93 octane and no additives. Raw gasoline. When the fuel arrives at an terminal. That's where the gas is made up to meet the regulations on fuel quality.

The terminal receives the gasoline and when its getting loaded into a tanker truck (9000gallons) that's where ethanol and Trimethylpentane (Isooctane) (Octane) is injected into the fuel.

87 octane rating gasoline is the same rating as 87 octane with 10% ethanol.

89 octane rating gasoline is the same rating as 89 octane with 10% ethanol.

91 octane rating gasoline is the same rating as 91 octane with 10% ethanol

93 octane rating gasoline is the same rating as 93 octane with 10% ethanol.

The problem with gasoline with ethanol is the ethanol separates from gasoline when water gets into the fuel. This is called Phase Separation and it clogs up fuel systems in vehicles because it leaves a film residue on fuel lines and plugs up fuel filters and plugs of fuel injectors. So vehicles that have problems with its fuel system clogging up is usually because they have lots of moisture in the fuel tank causing fuel separation or when you buy cheap gas which usually means the station has water inside the underground tanks causing fuel separation or lack of any fuel additives.

So buying gasoline without ethanol is better and will keep fuel systems clean but if you have a vehicle that has a dirty fuel system and you have been using gasoline with ethanol and then you start using gasoline without ethanol there is a good chance you will have fuel system issues. Most of the time when people have fuel system issues it's not because of where they bought fuel it's because of lack of a clean fuel system and ethanol leaving a film.

When gasoline has ethanol injected the ethanol brings down the octane rating for all grades of gasoline.

87 octane with 10% ethanol is only 84 octane until more Trimethylpentane is added to gasoline bringing back up the octane rating.

89 octane with 10% ethanol is only 86 octane until more Trimethylpentane is added to gasoline bringing back up the octane rating.

91 octane with 10% ethanol is only 88 octane until more Trimethylpentane is added to gasoline bringing back up the octane rating.

93 octane with 10% ethanol is only 90 octane until more Trimethylpentane is added to gasoline bringing back up the octane rating.

And when you buy a brand gasoline (Shell or Exxon Etc.) the loading process is also where the brand additives are added. So depending on what terminal a tanker truck is loading at is where the brand gasoline is made. But most terminals are on the same pipeline. Or at least where I work. (Fairfax Va). So the gasoline is all the same until a certain terminal adds its own additives but all terminals have the same standards to follow when it comes to octane ratings and ethanol standards.

So cheap gas is a fuel with no additives but the same standard 10% ethanol or without ethanol.

Gasoline with ethanol has lower BTU's. Which means less bang for your buck. Gasoline without ethanol will give you more bang for your buck.

High octane does not mean more power. Octane is the flash point of gasoline. High octane has a lower flash point. High compression engines create high temperature's so a high octane fuel is needed to it doesn't pre ignite and high octane burns longer. The high compression needs a longer burning fuel to make up for the high compression. Low octane has a high flash point. Which means ignites fast but also burns very quickly. This is the same for gasoline with or without ethanol.

Hope this answers any questions you folks may have.

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Old 09-05-2013, 02:17 PM   #2
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So if I add lucas fuel additive (approx. 5 oz) every few tanks would you consider this is good or bad?

Lucas Oil 10013 Lucas Fuel Treatment

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Old 09-05-2013, 02:19 PM   #3
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Thanks good info. I do run at least mid grade in my JK, I DO NOT see any performance or increased MPG but the engine does run a lot quitter. I ran the 87 for a while went to multiple different stations and same results ping and chatter. Running the 89-93 what ever I can get where I am at engine has no pinging or valve chatter. I typically always buy my gas on base just because it is convenient and never had a problem.
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Old 09-05-2013, 02:32 PM   #4
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I run 89 octane in my boat ('97 Merc 3.0 LX carbureted 4 banger) and find it runs much smoother. It actually runs even better on 91 octane, but 89 is a good compromise money wise. I've never had pinging issues with it, it just seems to run smoother. Maybe because of the slower burn?

John
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Old 09-05-2013, 02:33 PM   #5
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Quote:
Originally Posted by yellowtailfan View Post
So if I add lucas fuel additive (approx. 5 oz) every few tanks would you consider this is good or bad?

Lucas Oil 10013 Lucas Fuel Treatment

Fuel additives aren't a bad thing. Some off brands may be a waste of money. Lucas makes great products.
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Old 09-05-2013, 02:36 PM   #6
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Quote:
Originally Posted by LV Naturist View Post
I run 89 octane in my boat ('97 Merc 3.0 LX carbureted 4 banger) and find it runs much smoother. It actually runs even better on 91 octane, but 89 is a good compromise money wise. I've never had pinging issues with it, it just seems to run smoother. Maybe because of the slower burn?

John
I agree. You can run whatever fuel you want. You have to watch any listen to what your or anyone's vehicle is doing to determine which fuel you should be using. No one is wrong in what fuel they choose to run. But the potential to be wasting money is always a factor. If you find your car or truck runs better on what ever fuel you pick such as octane rating or with or without ethanol then you should keep running it. You can have the same exact make and models but have different results.
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1990 YJ Wrangler 4.2 Inline 6 bored 0.30 over MC2100, HEI

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Old 09-05-2013, 02:39 PM   #7
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Originally Posted by HAFICON View Post
Thanks good info. I do run at least mid grade in my JK, I DO NOT see any performance or increased MPG but the engine does run a lot quitter. I ran the 87 for a while went to multiple different stations and same results ping and chatter. Running the 89-93 what ever I can get where I am at engine has no pinging or valve chatter. I typically always buy my gas on base just because it is convenient and never had a problem.

Good choice. Thanks for reading.
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What do women and Jeeps have in common? The harder you ride them the more money it's going to cost you.

1990 YJ Wrangler 4.2 Inline 6 bored 0.30 over MC2100, HEI

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Old 09-05-2013, 04:06 PM   #8
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I will be posting some more info soon about how fuel grades are made and what percentage is required to make the fuel grades. Thanks for reading.
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Old 09-05-2013, 04:23 PM   #9
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Good thread, n2trucking, thanks! Subscribed!

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