I used Torco this time out to see if octane was a factor, but I have not tried ethanol free. The only place I know of that I can get it here is at the track, so I may to look around a little or try filling up there next time.
Between the altitude and temperature I’m pretty much thinking I’m starting to run into the limits of the car/engine (without further modification).
If that’s the case, I’m probably ok with it given that I regularly get comments from the guys in much higher performance cars (Camaro, Porsche, etc) on how surprised they are at how quick the X1 is