OK here's what I've had on mine. This was with about 120 miles on it on a 20 degree day.
In low MAX speed was 33 mph when it hit the rev limiter. I was on ice and didn't realize I was even in low until I hit the rev limiter. Came off a trail onto the lake and started getting after it.
In high range MAX I could get was 48 mph in a wide open field. And I did NOT hit the rev limiter in high range. I think there is a speed limiter programmed in them. Because it was building speed, building speed then like coast.