That sounds very sustainable.

Let's see, 2.4 miles one way or 4.8 round trip, * roughly 46 calories/mile at my body weight, with 3500 calories in a pound, I could lose or keep off a pound every 15 days! (I know the charts tell you how many calories uphill vs down, but I figure for every up you have a down & vice versa, so I don't get too fussy about that.)

How long have you been commuting? What effect has it had on your health? Have you channged your work attire since commuting by bike?
Thanks for sharing your experience.