I get 14-15 on my daily commute, in lots of stop and go highway traffic and 19-20 pure interstate. With lots of long trips I can keep my overall average above 17.
2015 M5, Alpine White/Full Black: Exec Pkg, Driver Asst, DCT, black 20s, More...
2013 X3 35i, Vermillion Red/Sand Beige: MSport, Premium, Technology, Premium Sound, Hud, More...
Gone '13 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i