ON an ICE, since the wheels are directly connected to the engine (ignoring the transmission), there is a direct relationship between the miles traveled, and the wear and tear on the ICE itself. That relationship has almost no meaning on something like an i3, since the REx's operation is dependent on load, not speed except in a fairly loose fashion. There may be times when the REx is roaring at maximum RPM, but the road speed is low, and vice-versa. The only rational way to determine wear and tear is to count the start/stop cycles, and keep track of the actual time running. Crawling in stop and go traffic with the lights/heat/air-conditioning/etc. on could be lots of hours of its operation, verses drafting a truck at high speed. This is where the condition based logic makes lots of sense. We can only see a vague, indirect relationship to that by noting when service is required as dictated by the computer in the car.