I average 12.5-15 on my commute, and max out at 22-23 on flats. I can keep up with most, but not all, ebikes, and am slower than most road bikes.

I probably couldn't keep up with you + ebike if you average 15 on a regular bike.

I wonder how the governor works. Does it just stop assisting at 20, or does regenerative braking automatically kick in?