Based on a "calorie burn" computer I found online somewhere, I think I burn about 100 calories per mile walking (4.5 mph) and about 50 calories per mile cycling (13+ mph). BUT, as others have pointed out, you burn more calories PER HOUR cycling because you go more miles in the same amount of time.

This post was interesting to me because I started regular fast walking in 2003 to lose weight. I did 4 miles a day as hard as I could go, and I went every single day. For a while, I restricted my calorie intake, too. Over the summer of 2003, I lost about 25-30 pounds. To maintain, I kept walking every day, even after I had lost the all weight I wanted to lose.

Then I tried jogging, which in my case was a stupid thing to do. Between improper shoes and an aging body, I hurt my ankle so badly than I couldn't walk (for exercise). But I had to have SOME kind of exercise, so I wouldn't get out of the habit. Then I remembered my son's MTB sitting in the garage--and the rest, as they say, is history.

I'm not sure I've lost any more weight since I started cycling, but I've definitely kept it off, and cycling is way more FUN than just walking around and around the neighborhood. I no longer count calories--I just go out every day and burn them all off.

My ankles don't hurt, my legs feel good--the benefits just go on and on.