funny, from what i read, people were paying 8-10 dollars a gallon for the xylene, or 6-8 for the toulene, then you figure atleast $1.50 a gal for 93 octane and your looking at $9.50-11.50 a gal for xylene+93 octane mix (1:1 ratio), and $7.50-$9.50 for the toulene mix (again 1:1 ratio), so you figure splitting the prices in half and your looking anywhere from $3.75 a gallon to 5.75 a gallon. On the other hand, 100 octane around here cost about $3.50 a gallon (or so i remember), and i think i figured out one time a 55 gallon drum of i think it was sunco 112 unleaded (not sure on that one, just remember it was unleaded stuff) came out to be about $6.00 a gallon.
imo im gonna stick with the real stuff..to much research has gone into modern day fuels for me to try to 'mix' some stuff up, i love making and fabricating things, but i'd like to see long term effects on these cars with jugs of 'paint thinner' and 'cleaner' poured into dsm tanks of 93 octane.
thats just my $.02
someone prove me wrong, so i can try it as well