Well the wife came home and I finally figured it out.

Get the mpg on the dash screen, hold the BC button stalk down for a few seconds until PROG is on the screen, then press the set button on the radio dealie for a few seconds.

What a PITA.

On a good note though, I got rid of all the other things on the display that I don't use... MPG2, time, date, stopwatch, 8 track tape, etc...

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