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10% you'll never see a difference, alcohol mixed with unleaded isn't hard on parts at all, and there's a ton of people using it at E85 level in cars that have been converted with zero issues...when old racers and car guys say this it drives me nuts, the majority of this talk comes from the drag strip where cars run Methanol at 95-99%. Then YES its very corrosive and eats everything . Unless your running your car on E90 or greater, You have nothing to worry about but cleaner injectors and less carbon build up on valves pistons and rings.
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