[Jack Zupan]

Freddie,

Your math is correct. I don't know what xylene costs off hand but using the formula again your 4.5 gallons would cost you $12.38 plus your 15 gal of 93 octane. Say you get that for $1.60, you have $24 + $12.38 or $36.38 in your tank. That's $1.87/gal, cheaper than CAM2.

To put in my two cents as well. High octane gasoline is of no value if you don't have a detonation problem. Unless you are running a high compression engine, 11:1 and up, you probably don't need it.

Jack Z