What is the best gas grade for 1991 dodge dynasty?
Any top tier name brand fuel such as Shell. Use 87 Octane.
Agree with TOM.
Mechanic recommended Sunoco 89 grade. My mpg is at 7.5
89 Octane won't hurt it, but if you are only getting 7.5 mpg it may need a repair or tune up. 89 Octane will likely not help the fuel mileage.
I had a recent tune up. New spark plugs pcv valve air filter oil change with very little improvement. Yesterday I purchased Sea Foam motor treatment and the salesman said mpg should improve at about half a tank. I hope so. The car runs very well but I'm having transmission problems Thank you
At 7 1/2 mpg I would use the cheapest gas I could find.
Sea Foam won't do squat. Just saying....
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