With some effort and right foot mods you can get a lot better than 38.
I've done several long trips to Oregon Coast on two lane highways, about 300 miles each way and got about 49 mpg going and coming back, speed kept to 55 mph and summer fuel, tires at 38-40 psi. The experiment was repeated several times so I know it was not a fluke.
The way I look at it is that, from my experience, on level ground at about 45 mph steady in 5th gear the drive train is at its maximum efficiency, with instantaneous mpg holding steady at or a little over 50 mpg. If you can sustain that or something close to that for a long time your mileage will be, guess what, close to 50. (my Oregon trips prove that) All the stops and starts, red lights, needless accelerations, cold engine, idling, winter fuel, low tire inflation, etc etc. just drops you down from the asymptote of about 50-52 with this vehicle. These conditions are present during my daily driving and I am getting anywhere from 30 to the low-mid 40s per tank.