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I've used VP 104 UL and measured the results.. (archive)
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Posted by Stan on July 16, 2001 at 08:45:59:

In Reply to: Anyone mixed or used race fuel in our cars? posted by KevinS on July 14, 2001 at 21:33:01:

It helped a bit under ideal conditions - cool day, dry, high barometric pressure. Insurance against detonation / preignition at the track is another benefit.

The biggest thing I noticed is a reduced drop off in performance on very hot days when everything is heat soaked. Ever notice that car car loses some sparkle on hot day? Especially after lots of hot idling, and yet runs extra nice under cool ambient / non-heat-soaked conditons? The better gas makes the car act more like when the weather is cooler. So in that case it's not that you're getting more HP, it's more that you're keeping more of the cool weather performance longer than a car running normal street gas. I didn't find much benefit to running straight 104 UL compared to a 1/3 to 1/2 mix with Ultra 94. Ultra 94 seems to give good HP numbers but seems to lose HP when things get hot. Some other gasolines seem to provide less cool temp HP but more than Ultra 94 under hot conditions.

I'm also running a relocated air temp sensor to avoid temporarily excessive air temp signals. You can relocate the air temp sensor or perhaps even use the one behind the bumper for the OBC. Or at least heat shield the metal flap box.

Stan

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