In every test I've seen, the AC is lower impact than the windows being down.
I played with mine on a road trip, used the cruise and drove 100 miles on AC and 100 with windows and sunroof open. The windows cost me 3 MPG vs the AC.
The OBC even was able to tell.
Dave
Dave __________________
Dave - PDX
1995 318ti - Active Black and Tan.
2005 330xi - Mtech 1 - 6spd - Orient Blue/Black |