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I had a 14 Eco 6 speed manual, I don't think putting in 93 octane does almost anything or it didn't in my car, I ran 87 octane just like it has in owners manual for 22500 miles and I think I tried one tank of premium and I saw almost no difference. In older models it did make a difference so folks say. Using top tier has makes sense it is in the owners manual. Just keep dexos 1 oil in car, keep oil changed and keep up on service and car should last a long time. premium gas where I live is at least 25% more in cost, in no way shape or form does it increase fuel economy by 25%. Maybe low single digit increase if any.
 
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