At 13:1 you won't be mixing it with pump fuel IMHO.
The next engine absolutely will not be raced with a 50/50 mix, like my current 10.5:1 engine, but it will be ran on the street with straight 93 and a conservative tune, for Drag Week ventures. At the track, it'll be switched over to straight race gas.
A few years ago, we had a fire at a local guys garage/barn (he lived in the country). In it, he had a few tanks of oxy/acetelyn, like most every farmer and gearhead has. While the fire department was fighting the fire, one of the tanks exploded. Luckily, nobody was harmed, but it made a hell of an impression on everyone. Since then, I've kept all my tanks of oxygen and acetelyn and fuel jugs in one corner of my building, at the nearest corner where they would pull in if fighting a fire. I did that so it would be easiest to keep that corner from overheating and exploding a tank...in theory anyway, provided they got there in time. I certainly don't want people getting killed, because usually I have 6 oxy and acetelyn tanks, and about 40-60 gallons of different fuels at any given time in there, which is probably enough to turn the building into toothpicks and coiled steel.
