Wanted to add an update.
65/35 hwy/city I got about 22.4-23 (just added today). GRANTED I just got my JB4 installed + catless DP + axle back installed so I've been a bit boost happy as well (trying my best to test out the JB4).
When I went on a 34 mile highway commute right after fueling, I averaged 28.2 mpg and it was still rising when I got there. Probably could have gotten it to 30 with some babying.
2011 N55 135i | Wagner Tuning Highflow DP | AA Signature Exhaust | JB4 Stage 2 | LCI Tails | ER CP
2016 M3 | AWE Switchpath Diamond Black 102mm