The amazing thing about bicycle computers is not that they work, but that they work as long as they do on one little battery. This, long battery life, is the reason you can rack up quite a respectable total of miles traveled.
This particular computer -- at about $20 the cheapest I could find at the time -- has been on this bike since the spring of 2012. So the 11,111 miles were accumulated over three years of riding. It doesn't take a lot of effort, just the idea of getting on the bike whenever you have an hour or two not otherwise taken up with important things like making a living or reading a book.
Of course, if you could ride that distance for routine daily trips around town that normally would take a car, you would save around 529 gallons of gas or $1,878 in credit card bills. (That's if your car got 21 miles to the gallon and gas cost $3.55 a gallon.)
The downside is that you would also get soaked when it rains. (hh)