I dropped off the 914 with Alan at A&P today to upgrade the brake cylinder and do a front end alignment. Brett, a local guy, is going to purchase my two leftover transmissions and Curt from Salem is visiting today to see the car (hopefully back from the shop).
In the meantime, I took some approximate readings from my ammeter and voltmeter as I drove on flat roads this past week. Overall driving at 20mph tends to pull 30 amps at 140 volts. Driving at 60mph (flat road only) pulls 90 amps at 135 volts. This averages out to around 205 Watt-Hours per mile. Paul Jorg asked for this info, so hopefully this is what you were looking for. I suspect that the fluid resistance in the transmission consumes quite a bit of power.
Although I hate to admit it, there's still a faint screeching sound that comes from the transmission when I spin the input shaft with the electric motor. The sound goes away after I drive a block or so, which leads me to believe that the transmission fluid isn't getting into all the bearings it should. The rather frigid mornings probably aren't helping the situation either.