I found something interesting with my Parisienne. When I put in the 4 speed and took it for a spin I found the odometer to be bang on. However, the speedo reads a bit high or low, I can't remember which.

I checked the odometer along Glenmore Trail ouside Calgary heading east. It's flat as a pancake, and there's a crossroad every mile (got to love the Western Canada grid roads) for about 10 miles.