Slightly OT: I assume it's normal for maximum gear to be "7" in Sport Mode? If I use the paddle to shift to 8, it just drops back down to 7 after one or seconds. Not sure why BMW would do that but I Googled and also saw a comment on Edmunds.com. I guess if you want economy on the highway, you just switch to Comfort mode.
2013 x35i (Space Gray, MSport, CW/CWII, DHP, Premium, Premium Sound, Technology, BMW-Apps)
Retired: '09 C300 4Matic, '09 GTI, '06 750i, '05 C55, '04 R32, '03 M5, '02 GTI, '01 M5, '00 M-Coupe, '00 540i/6, '99 M3 Coupe, '98 M3 Coupe, '96 328i,... '86 4000 CS Quattro... too many to list.