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Just a datapoint - Barrett says their 9:1 engines are still fine for 91 Octane. Almost all the engine builders agree that 8.5:1 is good for 91 Octane.
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Poll results
i started this poll last year. the results show that 1/3 of the pollers are using something other than 100LL. this is a saving of about $1/ gal. 8 gal/hr= $8/hr x 2,000 hr tbo= $16,000 toward overhaul. not bad.
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