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Old 08-25-2003, 04:53 PM   #1
Scooby Newbie
Member#: 42323
Join Date: Aug 2003
Location: VF35, Pinks
2004 WRX
Silver - UTEC, Tuna, TBE

Default Toluene

Sorry if this has been asked before, but the search engines are down. I've been doing a lot of research on Toluene, but am still a little warry of pouring it into my gas tank. I live in California, so I can only get 91 octane gas without spending a fortune on 100 octane race gas. If I use 2 gallons of Toluene (114 octane) mixed with 12 gallons of 91, I should come out somewhere around 94.5.

Does anyone have any first hand experience with this? Or xylene?

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Old 08-25-2003, 06:15 PM   #2
QA Guy
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Member#: 6739
Join Date: May 2001
Location: Houston, TX
2002 WRX


Yes, lots of people are using toluene. I have heard that xylene is harder on rubber than toluene, but have no firsthand experience to support this.

Here's a thread for you:
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Old 08-25-2003, 06:56 PM   #3
Wombat North
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Join Date: Jul 2002
Location: Eats, roots and then leaves
STI, EWG 8cm Green
UTEC/ECUtek/WI & SD tune


All your questions answered


Excell spreadsheet at the bottom of this chart/page to calculate mixing.
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Old 08-26-2003, 05:25 AM   #4
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Member#: 14141
Join Date: Jan 2002
Location: 13.239@102.85 @ 5800 ft on 13T
2002 Impreza WRX

Default works good

Either xylene or toluene work just fine. Toluene is frequently 20% - 30% of the blending stock in high octane fuels so putting a little more in the tank is basically what happens with the high perfomance fuels anyway. The refiners generally hold xylene content down to much lower levels, probably because it has a much higher boiling point than toluene.

There are quite a few of us who have used anywhere from 1 :4 to 1 : 6 blends of toluene and or xylene in 91 premium to get a little better octane profile.

In some areas of the country toluene is very tough to get, and thats the main reason many of us use xylene. It is just easier to source.

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Old 08-27-2003, 10:45 AM   #5
Scooby Newbie
Member#: 31777
Join Date: Jan 2003
Location: Roanoke, VA
2003 Subaru WRX


Originally posted by QA Guy
Yes, lots of people are using toluene. I have heard that xylene is harder on rubber than toluene, but have no firsthand experience to support this.
We use Tolulene in our homemeade traction compound for our go-kart tires, and it REALLY softens them up. Xylene doesn't seem to work as well. Of course we also mix it with lacquer thinner and ATF, so that may or may not mean anything.......
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