My speedo can show 286 and computime shows up to 294. Based on gearing commander the 286 speedo reading is correct. I have noticed an 8kph difference in top speed depending on how I come onto the straight. When you add it up around the track ie, top speeds, braking for turn 2 up to 240, into 4 190, into 6 190, into 11 over 200 your exit speed off the turns compounds pretty quickly. Like your exit out of 2 can have a +10kph difference at 4.