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i was under the impression that the higher the octane the cooler it ran and the harder to ignight the fuel. i was told it'd be counterproductive in the horsepower world unless you had high enough compression to need to combat pre-ignition. we run 110 sunoco from 55 gallon drum in the racecar and it works great 11-1 compression and have raced for over 2 hours straight without issues. the lower the octane you can run without melting the pistons the higher the hp's will be.but that's race fuel i don't know if its the same as aviation fuel.
Bought a New JD tractor over at the farm and the dealer told us that they are voting in the next couple of weeks to go up to 15% Ethanol for 2011. He said that everyone would need to run 2007 and newer equipment to handle this crap.
I stopped using seafoam when I learned it is 10-20 % isopropyl alcohol. I am not adding more alcohol to any of my fuels. I now am mixing my own version of seafoam without the alcohol. You can search the net for it if you like. John