Jafortune is correct. If you unlock the ignition by putting the key in the first position after lock, it will not turn on the electronics for the speedometer.
I own a 2003 Touring edition of the PT Cruiser with a 5 speed manual. I have towed it for three years. It shows 39,000 on the odometer, and the total mileage including towing would be a little over 70,000 miles.
W8RLM - Bob
2006 Winnebago Journey, Model 39K, 2013 Dodge Dart