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I'm fortunate to have a local bulk petroleum/lubricants dealer (Nickey Petroleum) about 4 miles from my house. I take a five gallon can to them and fill-it with Sunoco 110 racing fuel. I then mix 5 gallons of that stuff with approx. 12 gallons of the 91 octane at the pump, yielding a 95-96 "mix" that is plenty stout and the added bonus is that it smells great!. I pay about $5.00/gallon for the 110, but I'd probably spend close to that in decent octane boosters to yield the same octane.
-Deano
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