If you are interested in drive time, average speed or such the bike speedometer keeps track of that and allows automatically for stops. They have the advantage of being self powered and can be calibrated to work on a wide range of wheel size.
So rmatt007, if you stopped for lunch, a couple pee breaks, and fueled up at least once what was the average speed for the time you were actually riding? I wish I'd sifted my bike speedo from my bike to the Wing before I took my last week long trip. It would have been handy to use for total miles run since I reset my trip odometer when I refuel. The Cyclometer I have shows the highest speed attained which might be fun to know. I will move the thing to my bike this week and see how I like it. The calibration is quite accurate, you roll the bike forward ten wheel revolutions (counting from when the valve stem is at the bottom) divide by ten the distance covered and plug it into the speedometer in centimeters. The things are accurate since they actually are calibrated to the actual effective tire diameter including the amount the tire loses in the flat spot where it contacts the road. Since the front wheel doesn't skid (we sure hope) it's pretty much onfor distance. The accuracy of the speed readings of course depends on how accurate the clock is and that you can check against a calibrated time source. Anyway it will be fun to stick on the bike, at least it's small and black and will blend in nicely.