I'm not a car knowledgeable person and could possibly be over thinking this. I put premium in my car. I've gotten my car to a consistent 26 to 28 mpg. I don't know when my mpg went down but I looked yesterday on my car and it's down to 18mpg. I haven't changed my driving habits. Any other ideas then me jumping to the conclusion the quality of gas has decreased?
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Colder temps resulting in air that requires a denser fuel charge, combined with gas companies that know this, so, cut their fuel with a higher percentage of ethanol, is why you get lower mileage in the winter. Equipping every new car with remote start, so that people run their cars 15mins to a half hour before driving them has only made it worse