Long story short, here are MSDS info from mobil 93 “bottom” Sunoco race 100oct “top”. These are a little vague, but it gives you an idea of whats in your fuel. But given the numbers of 15% for MOBIL 93 is xylene, and “ 15% of 13 gallons” is 1.95 gallons of xylene per tank, plus .65 gallons of toluene per tank would equal 2.6 % per 13 gallons. And the race fuel has a max of 30% toluene and xylene, that would be 3.9 gallons of the mix per 13 gallon tank. So if you were to add 1 gallon of xylene or toluene, it would bring your mix to 3.6 gallons per 13 gallon tank of aromatics or 27% toluene-xylene mix.
I rember a thread regarding how much you can add to be safe, and it was around 30%. But that’s a total of 30%, so for us with a ~13 gallon tank, that’s 1 gallon of additive.
1 gallon should bring you up to the high 90’s, roughly 99oct from 93oct. but here is the good news, it only costs roughly 8 dollars extra a tank.
also your fuel economy should go up a few points, but lets say you drive 15,000 miles a year, at 30mpg with a 13 gallon tank with 93 oct at $3.50 per gallon, your spending roughly $1750 a year.
know if you use the same numbers but add the cost of toulene or xylene, wich roughly comes to $4.15 gal, its a extra 300 a year. buts thats at the same milage,but ive seen the high 30's using it. so it comes out to be the same in the end

Sunoco race fuel

LIGHT PETROLEUM DISTILLATE 8006-61-9 0 - 0-% 50
TOLUENE 108-88-3 0 - 0- % 15
XYLENE 1330-20-7 0 - 0-%15
MTBE 1634-04-4 0 - 0-%15
TERT-BUTYL ALCOHOL 75-65-0 0 - 0-%10
CYCLOHEXANE 110-82-7 0 - 0- %9
ETHYL BENZENE 100-41-4 0 - 0-%5
N-HEXANE 110-54-3 0 - 0-%5
NAPHTHALENE 91-20-3 0 - 0-%5
1,2,4-TRIMETHYLBENZENE 95-63-6 0 - 0-%5
BUTANE 106-97-8 0 - 0-%5
BENZENE 71-43-2 0.1-%4.9
TERT-AMYL METHYL ETHER 994-05-8 0 - 0-%2
CUMENE 98-82-8 0 - 0- %1
TETRAETHYL LEAD 78-00- 0.0-0.15%


Mobile 93

MTB %15
ETHANOL %11
XYLENE %10
ISOPENTANE %9
TOLENE %5
PSEUDOCUMENE %5
BUTANE %4
2-METHYLPENTANE %4
PENTANE %4
TRIMETH-BENZENE %3
3-METHYLPENTANE %2
BENZENE %2
DIETHYLBUTANE %2
plus some more small stuff in the less then 1%,

 

i just buy 94 oct from Sunoco and call it a day

 

its only if you want that little bit extra

 

dont know what your going for but Tulene is dangerous to handle and if you forgot, w/m injection takes the octane rating to~110 with a 50/50 mix. Not to mention FAR cheaper and safer to run.

 

just got bored at work and looked up the msds from several different fuel brands to include sunoco race fuel.

 

You dont have to post every thought or finding. I dont think one person on here would think about doing anything like this

 

ya, they probably won't, but ive been using the two diffent aditives for a while, and have a nice database at work to research from. if people use it, great, if not, . just thought i would share my reasearch findings on a forum, this one and on a few others. w/m sounds great though, but 300 dollars for a year supply of toulene and or xylene for almost the same results as w/m with out touching the engine bay sounds better to me imho. both have been argued as working or a waste, but the msds sheets don't, or can not lie by law. just throwing an idea out to the masses. oh, by the way, hows your build coming? can't wait to see the numbers out of that 2.0++++

 

You knew before about Nate (M this 1!) using it and not making all to big of a differnce.

Its coming along

 

just out of curiosity, where would someone get a hold of race fuel? It doesn't seem like a standard pump choice, at least not in Washington.

 

sigh, its hard as hell to find local, you might have to order it, or.............?