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Originally Posted by Imolator
I noticed that in the WQ Fez that I test drove, and asked the Sales guy if it was running on 91ron, it was. When I picked up my fez it was gravelly as well, but after filling up with Vortex98 and the computer learning the new fuel that roughness all but disappeared. Ford are idiots, if I was running a dealership I would make sure the Fez had at least a premium fuel, after all that is what they were designed to run on, and its the fuel that they give their best on.
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I only ran them on 95RON and 98RON
As I said, it's not that musical down low, just makes a noise. When wound up, it sounds a lot better.