I'll take a look at my OBD2 gage today again and watch gear selection and transmission slip, but my recollection is the torque converter locks early and often and the transmission doesn't upshift into 5th or 6th in city driving that much. I know that when towing the torque converter locks nicely as I was watching it to see if I was getting too much heat.

I'll try to remember to watch her to and from work today. A bit of expressway, a bit of city driving.

-- Chuck