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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Try and buy gas where they don't add corn based additives to the gas. CHS (Cenex) is where I fill up. If I can't find one, I go to Chevron. When I tried to save money, my fuel injectors gummed up while MPG went way down, and cost me more money to clean them up.