Ethanol or lower Octane?

[Farm2ride]

I can get ethanol free gas but 90 octane. My sleds call for 91. Would I be better off running 90 octane and ethanol free or 91 with ethanol? If I do run the E10, do you run any additives. Thanks for any advice.

 

[TheHardWay]

What elevation are you running at? The higher the elevation, the lower the octane. Engines can't burn all the octane at elevation. I ride at 10-12k' and am running 87-88 octane just fine even though my sled calls for 91. Sure, I can fill it up with 91 for a warm, fuzzy feeling, but I'm just wasting my money.

 

[AndrettiDog]

Same here. I run 88 non-ethanol at 9k-12k here in Colorado. Works awesome. The lower the octane you can get away with the hotter you will run.

 

[Blown Motor]

Farm, we run non-ethanol 90 all the time from 3-7k with zero issues. Most fuel you buy is within a tolerance of 1-2 pts anyways.

 

[Farm2ride]

We are generally between 7000 to 10000 feet so it sounds like I will be getting some 90 octane. Thanks.

 

[Dabull]

88 n0n-eth 8000-11000 here,dealer said it was all good

 

[kinge]

I have to change my clutches two clicks if I accidentally get ethanol. I also would go with the 90.