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Old 11-15-2014, 09:32 PM
Jamesconn Jamesconn is offline
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Default 85.5 octane why?



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In oklahoma and Texas the cheapest gas is usually the 87 octane. There's a refinery two miles from this gas station but it's more expensive than the south and they have a lower octane. Anybody in the industry know why?
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Old 11-16-2014, 02:51 PM
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Probably because the refinery does not supply them.
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Old 11-20-2014, 07:06 PM
bradtw191 bradtw191 is offline
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supply and demand
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Old 11-20-2014, 07:30 PM
spacelarry spacelarry is offline
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We have 85 octane in Colorado. At the pump it goes 85, 87, and 91 octane. I have been told that 85 works at higher altitude about the same as 87 lower altitude. Also my truck runs it fine. I only find the 85 at high altitudes.
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Old 11-20-2014, 07:42 PM
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Are you sure it wasn't E-85 fuel?

IIRC you don't need as much octane if you're in the higher elevations but that may be a wives tale.

Always run what your owners manual says you need

On another note....

Octane booster raises the octane by points and not numbers

If your gas is 85 octane, raising it 3 points equals 85.3

Read your label and the ingredients, other products will have the same ingredients for the most part but vary greatly in price.

Real "octane" boosters are actually expensive, the good ones anyways

The best way to raise the octane is to mix it with higher octane gas if you can


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Old 11-21-2014, 03:22 AM
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It's funny. Here we dont have less then 95 octane. (But I don't live in the US..)
And that's the lowest low octane.
95 low, 98 and up to 99. Premium diesel as well. Does the cars and trucks perform any good on a sub 91 octane? I always thought that low octane kind of "chokes out"/ reduces the performance of the engine.
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Old 11-21-2014, 07:34 AM
MattB4 MattB4 is offline
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Originally Posted by taki180 View Post
It's funny. Here we dont have less then 95 octane. (But I don't live in the US..)
And that's the lowest low octane.
95 low, 98 and up to 99. Premium diesel as well. Does the cars and trucks perform any good on a sub 91 octane? I always thought that low octane kind of "chokes out"/ reduces the performance of the engine.
It is the other way. The lower the octane the easier the fuel detonates and that is why you find it in higher elevation areas like Montana. Always gives me a chuckle that people think higher octane means better gas.
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Old 11-21-2014, 07:53 AM
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Originally Posted by MattB4 View Post
It is the other way. The lower the octane the easier the fuel detonates and that is why you find it in higher elevation areas like Montana. Always gives me a chuckle that people think higher octane means better gas.
Higher octane does mean better gas, tear an engine apart that has run low octane and look at how gunked up the top side looks, do the same with one that has run high octane and see the difference. There is a reason muscle cars and planes run high octane, it makes more power and equals better performance. Lower octane does detonate easier, that's why it doesn't burn as clean or make as much power. And proximity to a refinery has nothing to do with the price of gas. My dad worked for shell for 30 years.
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Old 11-21-2014, 08:16 AM
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here in central NM at 4600 foot elevation we have 87, 89, 91. this is exactly the same gas sold as 88, 90, 92 at lower elevations. the octane rating decreases with thinner air.

the Scandinavians do not have better dead dinosaurs than Americans. there are at least 3 ways to measure octane; RON, MON, RON+MON/2. if your measurement standard is different, your numbers will be different.
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Old 11-21-2014, 08:21 AM
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Originally Posted by John J. Rambo View Post
Higher octane does mean better gas, tear an engine apart that has run low octane and look at how gunked up the top side looks, do the same with one that has run high octane and see the difference. There is a reason muscle cars and planes run high octane, it makes more power and equals better performance. Lower octane does detonate easier, that's why it doesn't burn as clean or make as much power. And proximity to a refinery has nothing to do with the price of gas. My dad worked for shell for 30 years.
The reasons high performance cars run higher octane is they have higher cylinder pressures and thus subject to detonation if the octane was low. Called dieseling.

No the gas is not better.

Incidentally with the greatest form of information known to mankind people still do not look up stuff and rely on urban myths.
Here you go
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Virtually nothing is gained by filling up with a premium or more expensive grade of fuel than the vehicle manufacturer has recommended, the experts say. And many of the same experts explain that drivers may not lose much performance from their cars by using a lower grade of fuel than recommended by the car manufacturer.

There is little difference in energy content of regular versus premium gasoline. They both contain about 111,400 British Thermal Units of energy per gallon.

The price difference, however, between the fuel grades is anywhere from 20 cents to 40 cents, depending on where you live in the United States. The experts' consensus goes against the long-held belief by thousand of drivers who fill up with premium only, or on every third or fourth trip to the pump. The idea is to fill up with premium every so often to clean out the engines or rev up the performance of older engines.

But according to the experts, this practice is like tossing quarters in a wishing well, since most engines are designed to operate on relatively low-octane regular unleaded gasoline.

Octane is defined as a fuel's resistance to knocking. There is no benefit if the octane is higher than what the engine needs.
from here http://www.consumerenergycenter.org/...s_premium.html
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Old 11-21-2014, 08:40 AM
DMG DMG is offline
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Quote:
Originally Posted by taki180 View Post
It's funny. Here we dont have less then 95 octane. (But I don't live in the US..)
And that's the lowest low octane.
95 low, 98 and up to 99. Premium diesel as well. Does the cars and trucks perform any good on a sub 91 octane? I always thought that low octane kind of "chokes out"/ reduces the performance of the engine.
Other countries measure octane differently. Your gas is probably similar to ours


The 85.5 is for high altitude use and farm equipment.
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