Quote:
Originally Posted by Apoc
You should read the linked document. Unleaded race gas is legal for all motor vehicles provided they meet the regulations for chemical content. If they don't it is only allowed for racing vehicles and steps must be taken to ensure it can't be sold for on-road use. The important difference is lead content and you won't want leaded gas in a newer car designed to run unleaded. Here is a quote you should pay attention to:
"Many refiners, blenders, and distributors of racing gasoline sell and supply a “street legal” high octane
unleaded gasoline blend that complies with the specifications for California RFG. This complying high octane
unleaded gasoline is readily available and is legal for use in all motor vehicles both on and off road. Retailers
may sell this high octane “racing” gasoline as complying California RFG."
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Most likely it's the lead content in"racing" fuels of higher than 104 octane. However, I don't have the exact blending requirements, so can't comment on this in general.
MY take is that the only reason manufactured sell unleaded race fuel is for use in street cars, or for competition classes that do not allow leaded fuels. Lead will foul your O2 sensor of ran for too long, and will destroy your cats. If catless, no problem running low leaded fuel every now and then. Just don'e breath the smoke...
There's a station in Pasadena that sells 76 100 octane. VP also sells GT104 which is unleaded.
However, your better off saving use of these expensive fuels for when you actually have a track event. Sure, you may be able to feel it on the street, but at the cost of increasing your fuel budget for 50% or more? is it really worth it? Xylene is not cheap either, but will work if you can't get access to commercial blended fuels. Keep in mind that you can't really store it that long though, since Xylene is very volatile. Basically you need to put it in your tank at the pump, then pump in gas to mix it all up.
Car will run fine on 91.