[olyjohn]

The Lotus I had would datalog all kinds of data over time. It was very common for buyers to have someone do a data dump of the car's ECU to see how it was used / treated. The ECU was very much designed just to run the engine in this car (no infotainment, network upload, or any other integration), but kept some interesting long term data. That data can be very telling. It tells you percentage of time that the engine spent at each RPM, and percentage of time spent at certain speeds, percentage of time spent at various manifold pressures, maximum engine speeds at certain coolant temps, highest vehicle speeds attained, and number of full load standing starts.

This info would not be useful to LE, because they don't keep timestamps on the data. But it is a big tell to the dealership how hard you have been driving your car.