After three tanks of gas I'm at 17.5 for mixed C/H for a 2013 50i with the PP. I suspect it'll get a little better as the engine breaks in. My 2010 M5 averages 15.8 after 60,000 miles. At least the tank is a little bigger so I don't have to fill up every other day.
Last edited by BeamerandBimmer; 11-20-2012 at 01:05 PM.