Milage and fuel consumption might not be of interest to sell, that is just valuable for owners and renters.
But car manufactures and insurance companies are very interested in big data, and our hardware can track any moving part or electrical system in the car and create alot of data which they can analyze. We can for example see how the way you drive the car impacts the health of the engine, brakes, time between service to name one of 1000 different scenarios.