This is the first time I've heard of real-time vehicle telematics. I am impressed by how much data they are able to collect, and how they've applied it to company cars. I think your company is really doing something good with this, by controlling the emissions as much as possible.
It's widely used here in the transport industry and can track anything on the vehicle at all as long as that thing plugs into the ECM or has a sensor attached; real time telemetry is something motor racing teams have used for many years. I agree, it's incredible what it can track and I've seen some of the reports from the ones my organisation use and from heavy industry also (trucking and mining) and it's mind boggling.
I think it's working well for the organisation I work for and they are pleased with it.