I have made several trips over the mountain passes, aforementioned Eisenhower as well as Vail and Monarch passes and enjoyed every minute of the drive. The X3 35i easily passed when ever I wanted to and in fact will run as fast as you feel safe driving. (Within the speed limits of coarse)
Lotus7, thank you for the technical explanation. I like ColoradoX3 have been curious about the technical affect of altitude on the N55 turbo engine. That said, my seat of the pants experience tells me there is little if any impact by the altitude on this engine.
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