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I think mine was regular on the first tank, too. I've noticed a distinct increase in power since refilling with 91. It accelerates so hard in 2nd that directional stability starts getting iffy. :) Second is my favorite gear for demonstration rides for friends. They walk away very impressed.
100% agree. I'm trying to figure out if in first the torque vectoring somewhat limits it's acceleration trying to control potential slip, FiST's I don't think limit the power in first...

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