Gas types in a bike.

[the falcon]

(05-19-2014 05:25 PM)got2go Wrote:  e85 (85% ethanol/15% gasoline) can cause corrosion of aluminum parts and decay of rubber parts.
It has a higher octane than gasoline, but less energy per unit (this translates into lower MPG, all other things being equal).

Basically, unless your engine was designed to use e85, don't use it.
Use the lowest octane fuel where the engine doesn't ping/knock...that will give you the best performance.

Example: If manufacturer specifies 91 octane, you should be able to use 89 octane at our altitude (LV) as your engine will never achieve the cylinder pressures it would at sea level (where the octane ratings are specified).

What he said. I second the motion