[dwathencars]

In Michigan, my current favorite option is a mixture of what is sold as “Recreation Gas”, which is non ethanol 90 octane sold for jet skis, boats, off road buggies, etc. I mix in 1/3 race gas available at the same station which is 100 octane, non ethanol, high lead. The extra lead kicks up the octane mix. My Cobra, CSX2367, is a standard 289 hipo that knocks on “normal” fuel. We have several other collector vehicles that seem very sensitive to ethanol, in particular getting vapor lock with ethanol so the $4/gal recreation gas, which includes road tax, is a nice solution.