Your "true data rate" is completely wrong. You have no idea at what frequency they are converting analog to digital signals. You don't know for sure they are us

Your "true data rate" is completely wrong. You have no idea at what frequency they are converting analog to digital signals. You don't know for sure they are using off the shelf sensors. Your ignoring data sources in your calculations like OBD from the ECU or even GPS and AGPS data. etc etc.