Using my calculator The last 2 tanks I averaged 11.2. Probably 90% of that was city driving but to be fair we have a lot of long thoroughfares with 45-50 mph limits. I always use my cruise control and set it at the speed limit. Once I leave a stop light I hit resume and get back to speed as soon as I get to 20-25 MPH.
I ran 2 tanks of gas with the MDS off for the most part. Again I used the cruise control. Those tanks ran 9.6 MPG which to me disproves Chrysler is helping OPEC by putting MDS on the truck.
I have only done one good freeway trip and that was when the truck was new. 350 miles each way with a lot of hills up and down. Going I did 18.6 with the cruise on 70 MPH. On the way home, same route, I had heavy head winds and bad traffic in a couple places. That mileage dropped to 15.2. If your EVIC thingie isn't reading you have about 350 miles to empty when you fill up you are driving too hard. Towing a 8500 lb travel trailer in tow/haul mode I get right at 10 MPG. That is about the same as my '09 1500 did, but I tow the trailer faster with the 2500.
When I dropped the dollars on this truck I knew the mileage would really drop from what I got on my '09 1500 5,7 CC. That truck did a constant 12.5-13.5 in city and best of 22 on long freeway runs at 70MPH. So I figure if I can average for the long term 10-11 city and 15-16 highway I am more than pleased. I can remember years ago I had a buddy with a mid 70's 250 Power Wagon with the 440 in it. He never averaged more than 8-9 MPG in that hog. This 2015 truck has a lot more power and load capacity.