This answer lists the steps in a GM "drive cycle", for purpose of running certain diagnostic tests, and (?) re-calibrating certain parameters. (In my case, after replacing a heated O2 sensor.)
In particular, the listed steps begin with a cold start, followed by a 2-1/2 minute idle, followed by a half-throttle acceleration to 55 mph. To do this, it seems like I would need to drive to a highway on-ramp, sit for an extended period while the engine cools, and the perform the test steps.
Does it need to be that exact? Or, can I cold start, do the idle, drive on city streets to a highway, and then resume the test with the accelerate to 55 mph?