Will high octane gas inprove performance in a 2 stroke engine?

High octane gas for any engine is good to prevent build up on valves and internal combustion parts. If your familiar with the way a two stroke engine works, the fuel and oil enter the lower end of the motor where the crankshaft is. When the fuel and oil is dumped into that area, the oil portion of the fuel lubricates the lower end and piston walls and the gas evaporates up through reed valves ( which are nothing like your car valves and are not mechanical) and is combusted in the combustion chamber and then it happens all over again. The only moving parts in a two stroke engine are the crankshaft and the piston unlike a 4 stokre engine which has a crankshaft, a piston, lifting rods, or hydraulic lifters, and a separate exhaust valve and intake valve, and on most cars there are more than two of each. You might notice a little more pep out of your engine and the higher the octane the better burning with the ethanol that's in the fuel lately, but I wouldn't spend the extra money on the better fuel if it is a stock engine 2 strokes are great in the fact that you really cant kill em. Hope this helps.