[famoroso]

FWIW, I wired a rocker switch in line (no cutting wires PLEASE!!!) with the clock's ground. When I park the car the clock gets powered down (via cutting ground). When I go to drive ithe vehicle again in a day or a week, etc. the correct time gets set and I turn the clock back on.

I have yet to check what the clock's specific mA draw is, but will do so for shyts & grins at some point.