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Does anyone have any experience using octane boosting fuel additives in lieu of high octane gas? If so, which are effective from a cost and performance standpoint. My 2006 Outback has a 250hp six, and "recommends" but does not "require" high octane fuel. It runs stronger and seems to get better mileage with 91 octane though. I was considering using 87 octane fuel and using some after market booster. Any thoughts?
Thanks,
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