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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Not sure what kind of car you drive but most manufacturers say to use regular 87 octane. The exception would be a high compression/performance motor. I've been told by my mechanic that most folks that use premium in their cars are wasting their money. Also might put some quality injector cleaner in the tank once in a while. yep mileage goes down in the winter. Mine sure did especially when it gets down below zero. I'm not a mechanic just going by what I've been told. Hope you get it figured out
Just as a clue, if your engine has a turbocharger, use the 92 octane gasoline. A turbocharger has the effect of multiplying the compression ratio of the bare engine.