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I used to used klotz benol but experienced lots of “tacky gumminess” now I only use redline alcohol premix at 2oz/gallon
Yeah that's not the Klotz doing it, it's the E85 itself. If you go to a racing barrel E85 or E98 etc, it will not have any of the tar, it's just the cheap pump E85 that does.
Just run a tank of pump 93 and it will wash it all off the motor anyway.