I run 91 or 93 on my 87 canned tow tune. It's my understanding that it's an extra margin of protection towing my 8500# trailer on those hot days in the hills.
However I'm worried about running 91 when the supercharger is installed, it's near impossible to get anything higher in some of the more remote areas we camp. I put my faith in Bill's tuning to keep the motor together haha.
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