I think we have different definitions of "city" driving. And also when you "correct" for your tire size with a programmer it is probably still wrong.. Tire dimensions vary by a huge amount between mfr's of the same size. I corrected for my tire size with the diablosport intune and it was still not right after being verified by gps..I get an honest 8.9 to 10.5 miles per gallon in the city without even having a heavy foot. I live where there are stop signs or red lights at every city block, not just the ocasional stop and 30mph cruise. It just too much weight to be throwing around constantly lol..
However, I did see some improvement after custom tuning the car. I have the stoich AFR set a bit leaner with a bit more timing added in light load areas, mds hangs in a bit longer then normal (aka stays active up to a lower vacum limit), and I was also able to modify the shift points going up to 3rd gear for all throttle settings as well as downshifts too. Combine this with 40psi of pressure in the tires I was able to finally get what I thought was "acceptable" mileage on the highway.. I drove from Philadelphia to Outer Banks and had an average of 16.3 with a turtle shell on the roof before I hit the sand, and I would consider that 60% highway. After that I went from Philadelphia to Allentown ~80 miles each way and got 16.9 going north and 18.0 going south trying to conserve fuel for the most part.
Specs on the commander are 3 row seating,2006 limited Hemi stock ride height with surefoot pandas, AFE intake, MBRP 3" exhaust, and a custom tune I did.
The best part is, I was towing my friends Volvo XC90 6 miles through the sand @OBX in 4wd low and was getting 3.4 miles per gallon doing about 15mph.. The jeep performed flawlessly on the sand aside from my blown out shocks and struts.. I really need to decide what to put on as far as a lift goes...