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Agreed. My 3800-powered Buick gets much better mileage on straight gas than E10. Among other things, I got 37 mpg heading down to Florida on straight gas this weekend, and 30 mpg coming back on E10. The gas was most definitely not the only factor affecting the fuel economy, as my car was learning fuel trims and I was driving a lot faster on the way back.
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2012 Chevrolet Cruze Eco 6MT
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