I tried doing the GM procedure but had issue with getting to a remote area I could do the test. I do know it was approximately 150 miles to get the sensor ready. I firmly believe the key to getting the sensor ready is performing a sufficient number of cold starts and short trips under 60mph.
As I said, I tried to do the GM procedure but never had the DIC indicate to accelerate during the test. I attempted the GM test four times without success, then I had the wife do short trips and stay under 60.