Count me in
The ELM327 only draws 9ma. Given that we're talking about a car battery that has (on the average) 600 amp hours of capacity, a 9ma draw will take MONTHS to drain it.
The keep-alive in the car stereo probably draws more - and the ECU, and the keep-alive in the clock...
ref: ELM327 quick sheet
Good point guys about the battery. Will still measure the current draw once installed just in case.
Quick question, does the usb interface require a usb 2.0 port, or will 1.1 suffice. I imagine 1.1 will be more then sufficient.