Blending 100LL and autogas- the line is a curve! Mixing 100LL in lead free doesn't give you an average of the two fuels, you get more octane increase with the first unit and each successive unit of 100LL gives you a lower return on octane. You might very well get what you need with 10 to 20% 100LL avgas. I'd start at 33% and work my way down to 10% checking to see what changes. Look at operating temperature, if you have one of those IR thermometers I'd scan the head, exhaust manifold and muffler/stack and see.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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