Speed and Mileage Meter

And if you'd like to make your own, just print these two, use your copier to reduce them to a useful size, and then use an exacto knife to remove the view window areas. Presto, you've made your self a sliding lap speed calculator.

Thanks to Newt and Tris for letting me share this with you.

Also see: http://justacarguy.blogspot.com/2009/02/lap-speed-calculator.html