In the old days our local Model A touring club was supposedly driving around 45. Seemed like a good speed to drive to make the motor smooth out and run like a Singer Sewing Machine.
When some people started getting Garmin GPSs, we found out we were actually driving 50 mph. We all had inaccurate speedos or we never paid attention and just followed the Model A in front of you.
. Lots of the club members didn’t think their As could even drive that fast.