For twenty dollars. I hope you have already picked it up. Mix the two gallons of 5% with the two gallons of 10% and 15% it'll be a little less than 10%. the 12 1/2 percent i think was some kind of heli fuel blend. I tried a gallon of that once that someone gave me and did'nt like it. But the other four gallons i think you'd be a fool for not buying it. five bucks a gallon!!!!!!!!!!! your not going to beat that price anywhere.
As for the old fuel can exploding i read about that myself. It had to be at least five years ago, heck maybe even longer than that.
Now i do expect a thread later this year saying just how good your engine runs on this five dollar a gallon fuel. I've got fuel in my basement and garage older than that. Still works perfectly.
Run fast to get this fuel and don't waste time in front of this screen. Heck it's almost worth it for me to drive there for that price.

Dennis