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I have easy access to <10% 93 or ethanol free 91. Which would you choose? I've been using the 93 since purchase 3 weeks ago. Around 400 miles is when I noticed the chirp starting after long drives. I'm at 960 miles and I still have the chirp after a 20+ minute drive. It's not any louder, I'm just wondering who would use 91 free over the 93 with ethanol.
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