My average computer speed (with starts and stops) is around 11-12 in the winter time. Actual cruising speed is more like 13-14. And, since my computer measures up to .1mph increments, I would have to be up to at least 15mph to see a .2mph increase (which I do when I'm pushing a little harder/tailwind/downhill).

I know you were joking, but I'm just clarifying.