Ok, just in case everybody's forgotten, the Swiss Federal Laboratories for Materials Science and Technology looked into all this a couple of years ago while analyzing transportation policy options:
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car diagnostic tool
CARPROG FULL V4.01
"Maintenence" on the EV+ meant I was *required* to bring the car in every six months for a *mandatory* tire rotation and brake inspection, but they also were downloading data from an on-board recorder for research purposes. I suspect the six month requirement in the lease was due to memory...