A guy in our club uses 10% "club fuel" that he's had for 30 years in all of his engines.
He's a Pilot for United Airlines that flys the L.A. to Hong Kong route so he can't be too stupid!
His motto is: If it works, why not use it!
I might give him a gallon of my Wildcat 10% 2+4 stroke fuel but i'd hate to see him dump out all of his remaining 30 year old fuel after trying "my" fuel out!
big dan