did they not years ago, late 50,s early 60,s send Geoff Duke around the course, in a car with a "pedometer" or something simalair attached to the back of it
I think it was done for one of the comics,
Maybe the likes of tom or ian might remeber it?

Have to agree with David that it does need recalibrating, so much has been changed over the years, & what better time to do it than next year,

But if they do that,the 130mph lap might not happen!! so less publicity for the make of bike that does it!!
& as we all know, they have to take commercial interests very close to heart these days