Has anyone looked at the efficiency of using climate control versus opening the sunroof and creating extra drag? I was just curious. I know it depends on many factors (speed, outside temp, climate control temp), but lets look at a typical situation: 60's outside (ideal for sunroof) Speed at 55 mph Interior CC set at 72 on all auto (so this would result in some light heating but not a lot). Would the additional drag made by the sunroof be more than the energy required to keep up the climate control? Has anyone looked into this?