I've experienced this too and I actually just got my Maverick back about a week or two ago from the dealership service department. When I first start it up and drive It seems to buck a bit forward and back when slowly accelerating or holding speed around 25mph until it upshifts (I'm thinking...
From the looks of this, it looks like the vehicle has been running for almost an hour and a half since you reset Trip 1 and having driven less than 20 miles on this most recent fill up this is probably the average you would see for that combination of 19.4 miles and 1 1/2 hours of run time.