Ethanol is 116 octane, E85 is much lower.pewterpecker said:Anyone here tried running e85 in their rappy? It's cheaper than race gas and has plenty of knock-resistance to boot. All you would need to do is increase the fuel flow a bit to make up for the lower BTU's.
Your atv will be most reliable and perform best when it gets just enough octane to keep it from pre-detonating/pinging, no more and no less. If your bike runs right on 89 you're not going to gain any benefit by using a similar fuel with higher octane.kal1fornia said:will running a higher octane rating in your atv help the engine last longer and perform better?