http://www.superford.org/getfile.php?id=71311&toggle=fullsize&filename=speedgraph.jpg

I work for the railroad and we have something like this we use to check the speepometers in locomotives,i never thaught about using it to check the speedo in a vehicle!!!measure off 5280 feet and thats a mile and see how bad those new 44's throw off your bronco speedo!!!