FIXED!!!
Dropped the truck off this morning and picked it up about an hour ago.
Turns out there was a defective valve (or solenoid) in the pump. It was causing the converter to lock up almost all the time.
I didn't know that would have an effect on mileage but since I reset the mileage and drove about 50 miles, I'm averaging a little over 12 mpg.
I'll check it over the next few days but it appears to be working correctly.
Mark
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