I did glance down at my dash mounted speedo after observing a consistant 47 and change on the gps. Dash speedo was reading close to the same, maybe reading a bit faster.
I go with what the GPS says.
Heck I go with the GPS on my Ford Diesel. Seems the speedo is about 10% slow. Need to run 74 to get a true 70mph. Always wondered why the heck everyone passed me on the HWY. One of the benefits was no tickets for a long time but I do want to run at least the speed limit.
