What type of gas ? - Polaris ATV Forum
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post #1 of 25 (permalink) Old 09-26-2011, 11:12 PM Thread Starter
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What type of gas ?

New to sport. I just bought a 2012 500 sportsman, and all of my friends with atvs say I should only use 93 octane because of the ethanol crap. Just wondering what everyone else uses.
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post #2 of 25 (permalink) Old 09-27-2011, 01:24 AM
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You can run 87 and be fine... All of the octanes have Ethanol in them, unless you are getting race gas.

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post #3 of 25 (permalink) Old 09-27-2011, 02:46 AM
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I agree with your friends, but know that not all areas of the country use the ethanol in the same amounts...

I use hi test (Highest octane available) AND Sea Foam (1OZ per gal) in most every tank ful. I read FAR TOO MANY little annoying issues related to fuel and I simply would rather be defensive than offensive.

The factory recommends 87 octane as all that's needed.



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post #4 of 25 (permalink) Old 09-27-2011, 03:40 AM
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Use whats the cheapest, and use stabilize (or whatever the name is) for over winter!

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post #5 of 25 (permalink) Old 09-27-2011, 04:13 AM
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I too use 89 or 93 most of the time. It is my understanding that the higher grades are currently limited in the % of alcohol allowed. There is also a push to increase the alcohol content for lower grades which will cause even more problems.
If you read closely, the manufacturers recommend using fuel that is at LEAST 87 octane. Another issue for me on the 800 is mpg. I need all I can get. I enjoy hiking too but only if that's what I left the house planning to do that day.
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post #6 of 25 (permalink) Old 09-27-2011, 05:03 AM
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I use 87 because in RI, all grades contain 10% ethanol, so paying extra yields no benefit. These low compression engines run fine on 87 and its actually what the factory recommends. I spend the extra coin on seafoam or it's equivalent and run some in every tank to counteract the negatives of the ethanol and hence water particularly with a carburated machine. My .02

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post #7 of 25 (permalink) Old 09-27-2011, 06:06 AM
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Non ethanol gas IS available in Virginia for about .05 cents more per gallon.

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post #8 of 25 (permalink) Old 09-27-2011, 06:25 AM
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I run 91 octane in my atv's. Don't know if the 500 needs it, but with 11:1 compression the 850 likes it.

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post #9 of 25 (permalink) Old 09-27-2011, 06:28 AM
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I use premium fuel for my ATV. I don't burn through THAT much, so the extra cost isn't an issue. I dont buy it because of the higher octane rating, that ONLY matters in the vehicles with high compression engines. I use Shell V-Power because V-power is supposed to have additives in it that keep the fuel system clean. It makes me feel better about it anyway lol

Here is an interesting read on the octane myth

Gasoline/ethanol, or E10 has 3.3% less, energy than regular gasoline, so 3.3% more is required for the right mixture. (worse fuel mileage) It isn't good for anything that doesn't have O2 sensors and EFI or feedback carb or an adjustable main jet in the carb. Fixed jet carbs have to be re-jetted to run the proper mixture. I would try and run a non ethanol fuel if I had a Sportsman 500.

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Last edited by Brandoh; 09-27-2011 at 06:30 AM.
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post #10 of 25 (permalink) Old 09-27-2011, 06:45 AM
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I use all 3-87, 89, 93. Depends on the price @ the time. The only constant is
the addtion of SEA FOAM!!! Great stuff!! I

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