Our mileage so far has sucked. sDrive with 1,400 miles and my best is the current tank at 22.3. Granted this is what would be considered city with no hwy but it is still bad since overall since purchase were around 21 mpg. If you compare the S drive to the F30 the EPA estimate makes sense since it weighs pretty close to the same amount. How could the vehicles with the same engine, transmission, similar in weight be so far off in mpg? I'm only getting about 2.5 mpg better than my 2007 E93 manual but it is heavier and I drive it hard.
1995 325i, 1996 328ci, 1997 528i, 1997 Z3 2.8,2001 X5 3.0, 2001 330i Convertible, 2002 M3 Convertible, 2003 M3 Coupe, 2004 M3 Coupe, 2004 Z4 3.0, 2004 X3 3.0,
2007 X3 3.0, 2007 335i Convertible, 2013 X1 28 sdrive,
2014 M235 manual