I bought a commuter this year and did not put a speedometer on it. Then I started riding it on most of my rides and totally lost track of my miles. Now that I am back riding my road bike more Inoticed that I have slowed down due to my slow commuting and overeating.
I now have a computer on both bikes and will keep track again this year. I will put new batteries in the road bike and set them both to zero.
1800 on my road bike and not sure about the commuter. Probably around 1000 or so.