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For the longest time, here in Jacksonville, Sunoco was the only one left with ethanol free fuels. I used nothing but in my CX7 - Premium fuel only (turbo) and my Boxster S. Finally Sunoco gave in to ethanol use, so now everything available has up to 10% and no-one can tell you how much is in it.
Mileage dropped 10% immediately in my DD and I think about the same in the Box, but I don't track it. Performance in both was a noticed drop. I track my DD with every tank full and it goes up and down by 5% to 10%. I wonder if it's because of the amount of ethanol? I'm really consistent in the way I drive the car and also on all highway trips, at the same cruising speeds, the MPGs vary significantly by the tankful.
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Hybrid Mode
