You see? That is exactly why I think historical information about distance and time for a distance race is not very useful for determining average speed. For 40 years the organizers of that race have been saying it is about 21 miles, and it takes modern instruments to give us the correct distance. (Maybe the original distance was from a car driving from Put-in-Bay to Sandusky over the ice in the winter, and maybe it was a zig-zaggy path along the Christmas-tree trail .)