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Jackie (not verified)    December 31, 2015 - 4:13PM

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In my 2014 EC you can definitely tell a difference in 87 to 93 Octane. Especially with the SCT tuner set to 93. It improved my fuel mileage as well as performance. It went from mid 90's in the quarter to 105MPH so it make a major difference. Also I took a 6800 mile trip to Ca and Washington, mountains and all and average 23.7MPG. On pretty much level roads I was getting 26MPG all at 65MPH. So there is or can be a distinct difference in performance.

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