Ok I ran the rover at a slow constant speed for several seconds to generate a log file. I was able to download the log file and I can review the log. Now I'm trying to figure out what to look at. The wiki instructions reference a different version of Mission Planner, i.e there is a "Graph Left" and "Graph Right" button, but the instructions reference a "Graph this data" button. Using a dropdown in the middle of the screen, I can select "Speed/Ground Speed" and I see what appears to be the GPS speed. I'm guessing this is meters/seconds. Shows what I would expect, quickly reaching 2 meters/sec and slowly climbing to 3.25 meters/sec, before I dropped the throttle. Now where can I find the throttle percentage so I can compare the the GPS speed and determine a proper value for my cruising speed?