I have been driving the same route the past week and was a bit curious as to why my gas mileage varied rather inconsistently when I came across the following. My AC was on even though the AC indicator on the navigation screen said it was off. The LCD temperature setting display said I was in the 'auto' mode verses 'fully auto' mode. After playing around with the various climate controls I found out the following on my vehicle. If the climate control is off (hard button) and I proceed to turn on the fan (soft button) via the navigation screen the AC is turned on. This AC (soft button) shows the AC to be off and the temperature LCD shows the climate control to be in the 'auto' mode. In my mind I may have been driving with the AC on without knowing it. I plan to call my dealer tomorrow. Has anyone else noticed this?