went to buy a bottle today, didn't know which one was best

I think that isopropyl is to best for sleds
methanol is not good for sleds

do not use methanol in any great amounts in your gas, it will eat everything inside your carbs, brass fittings seals etc, carbs set up for methanol have been properly setup to run it.

Iso only..............best / cheapest source is your local drug store where you can get 99.9% unlike the who knows what the heck it is many auto parts stores carry.

Rick

iso only methal will wash the oil off you re pistons you ll seisze up. do t take chances