Back when I first joined this forum, I was working for a Union contracting company... I needed gas one day, and all I had was a 5 gallon can of Xylol (Xylene) in the trunk of my Civic.
On an empty tank, (Car wouldn't start again), I poured in about 2 gallons of the Xylol straight, so I could get into town to put gas in... about 35 miles from where I was, to a gas station I knew was still open.
I made it, and after putting 2 gallons of Xylol into an empty 12 gallon tank, and traveling 35 miles, it only took 10.75 or so gallons of gas to fillerup, which means I went about 35 miles on .75 gallons of Xylol, for a total MPG(x) of 46.4, slightly higher than normal, but I topped that tank off, and it wasn't an exact 2 gallon measurement of Xylol... so that can't be taken as gospel.
What I would guess happened, is that with the wicked timing advance that I had, I got more low-end torque from the Xylol's 114 Octane rating, which made it so that I could stay in higher gears for longer.
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