skata — All the internal car data is measured and transmitted in metric units (liters, kilometers, etc.). That's probably been true of all the car companies for decades now. That's one reason why the bolts have been metric for some time now. The CAN bus carries this metric data, which is being converted to US units for the US market. The Canadian TCHs are metric, and so read temperatures in degrees Celsius. You're probably right that the jumps seen in your degrees Fahrenheit readout is due to the conversion from Celsius to Fahrenheit — nearly two (actually 9/5) degrees F to each degree C.

Stan