My overall for mixed in town and highway is 18.5. Even when I spend several days in Madison or Milwaukee, I don't see less than 250 mi/ tank.
2013 328i MSport
2012 X5 50i (returned due to PCS move)
2008 M5 (traded for X5)
2004 330ix (former winter beater)
2003 M5 (traded with 103k, still working fine)