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Kirby,
I feel your pain. However, I seem to have found an additive that actually works. It’s called Lead Supreme (Octane Supreme now), and I ordered from Batterystuff.com. As stated, it is straight tetraethyl (lead), but the bottom line is that it has worked very well for me. When I bought my Cobra, I thought my compression was around 10 or 10.5:1. As it turns out, almost 12:1 is more like it. No more chronic fouling of plug and dark exhaust since using it.
The below if from their site and seems to be accurate:
TREAT RATES R+M/2
0.6- Ounces OB-130 to 1 gallon/fuel……….2.0 point octane increase
1.2- Ounces OB-130 to 1 gallon/fuel……….3.5 point octane increase
1.8- Ounces OB-130 to 1 gallon/fuel……… 5.0 point octane increase
2.4- Ounces OB-130 to 1 gallon/fuel……….6.5 point octane increase
3.0- Ounces OB -130 to 1 gallon/fuel…….…8.0 point octane increase
6.0- Ounces OB-130 to 1 gallon/fuel……..11.0 point octane increase
18- Ounces OB-130 to 1 gallon/fuel……..16.0 point octane increase
Hope this helps.
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