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No one is questioning your data. I was just wondering how a small amount of ethanol affects your mileage so much. I do not have the records that you do, I've just been using whatever gasoline comes out of the pump for my truck (don't drive it much anymore, I daily-drive a diesel) and I always get 25mpg city and 30mpg in the mountains. Maybe your vehicle is just not set up to operate on higher octane fuel...?
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I'm not coasting, I'm shifting slowly.
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