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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Bone stock cummins.
Cummins good. Power Stroke not so much