I just got back from a trip to the southwest with some driving above an altitude of 7000 feet. In general the van performed well due to the turbocharging, however it seemed to take much longer for the turbo to spool up when starting from a stop. In some cases the van would shift into second gear prematurely resulting in very slow acceleration. If I was very careful in how I applied the throttle I could get the boost up quicker and improve the acceleration. The start-up performance returned to normal at lower altitudes. Anyone have comments on this characteristic?