Let me add some information to what George has posted. Yesterday, someone on the Spec Racer forum raised some questions about the 100 octane unleaded fuel at Virginia International Raceway. I talked to the tech staff at Sunoco race fuels. As a result of that conversation, I posted the following on the SRF forum.I spoke with the Sunoco race fuel tech folks. All of their unleaded race fuels, except the 260GTX, have had ethanol in the formulation since about 2004 and the amounts have not changed over that time (the 260GT is right around 9%). It appears that in various parts of the country, the ethanol labels are showing up on pumps because of local or state legal requirements.
If you are concerned about the ethanol in these fuels affecting fuel system lines or fittings, or about fuel cell degradation, pump the cell and fuel system dry if the car is going to sit for more than a few days. If you have performance or other engine concerns, you will need to use your best judgment. If you have been using the Sunoco 260GT (100) without engine problems in the past, you should be able to continue to use it.
If you want to find out where 260GT is sold (tracks and other places), see
http://www.sunocoinc.com/site/Consum...T100Locations/By the way, if you find 93 octane unleaded in track pumps, this is not a race fuel. It is ordinary Sunoco 93 octane street fuel.
We are in complete agreement that what you find at a gas station is a complete crap shoot. For one thing, even "good" companies change formulations (for good reasons) on a frequent basis. That means you simply can't count on consistent performance. Worse, are companies that toss whatever is available into their tankers and the customer be darned.
Now, with regard to what you can smell not being dangerous: sorrry George, your source is jerking you around. That's simply not true. Yes, there are things that you can't smell that are not good for you, but they are not all there is to worry about. Some of the most toxic substances that unscrupulous fuel blenders use have distinctive odors.
Dave