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Old 11-07-2014, 07:40 AM   #16
03Alerosil
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Location: Minnesota
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In a late model fuel injected engine running a different octane makes no difference at all. The PCM just compensates for the different fuel. I have noticed a difference between running ethanol blended fuels and just regular gas but I live in Nebraska. My 3.4 alero seems to run better and get better mileage without running the ethanol fuel. It's not a drastic difference but just a little difference
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