Fx Fuel Consumption

As the prices climb, my buying habits have dropped from 93 to 91 to 89 Regular Octane... mpg per $/gallon doesn't justify Premium. Makes me wonder about real long term effect on engine and maintenance.

---------- Post added at 09:25 AM ---------- Previous post was at 09:22 AM ----------

18... mostly hwy

No knocking? Engine running louder? FX35 is premium only like FX50 right?
 
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