My GP gradually climbs to 210-225 degrees on extended highway driving of sustained speeds of 60-75 mph (takes about 50 miles to reach). Running with A/C obviously makes the temp a bit worse. If the outside temperature is ~80 or below the car runs at what I consider the normal range of 185-195 degrees.
I've only owned this car since September of last year so I'm not sure if this is normal. I've owned many GM's and they always run cooler on the highway than city driving. Of note, I had to replace the radiator when I bought the car. I have bleed the system and there are no leaks. Please let me know if the temperature this car is running at on the highway seems normal.