Ok, true story. When I was in the service my ship was in dry dock at Portsmouth shipyard in New Hampshire. Whenever I had liberty I would drive to Portland to be with my wife.
I remember one time a shipmate had a '46 Ford 8 and we were racing on the Maine Turnpike. I passed him and afterwards he said he was doing 100 mph. When I went by my speedo said 90 mph.
That's not the only time I saw such a difference in speedos. Looks to me like Henry made the speedo that way to fool Ford owners into thinking they were faster than they really were.

By the way, I knew about Richmond, but I like the saying. It bugs southern gentlemen.

And, leave my Taylor out of this! Don't make me come down there!