I can’t imagine a less productive employee than your typical 12 month bike commuter who

1) Arrives late or not at all, especially in the dead of winter
2) Arrives exhausted (and therefore unproductive)
3) Arrives sweaty and hot (less than helpful for group projects)
4) Limited work ethic, because not a slave to auto costs
5) Always eats the extra morning donuts and an extra piece of cake on birthdays