Ethanol mix petrol

[Zapf]

I think they call it E85 in the US or something.

[slopster]

I reckon it would be good to run a tankful through your bike every once in a while since the ethanol will absorb any water that might have accumulated in you fuel system. I think it would cause the bike to run ever so slightly leaner because alcohols burn better with smaller air fuel ratio than petrol.