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The 2 FFV I've owned 2010 Impala and 2002 Suburban both got 18% less MPG on E85 than E10. Round it off E85 needs to be 4/5ths the price of E10 to buy it. With blend testing using the Stratus, it's MPG follow's energy content within a few percent(data in old post). I only feed the Impala E85 when cost efficent. It was for a few recent week but not anymore.
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