Originally Posted by ItsJustMe
There was a guy on NPR Science Friday last week I think. He said that by his calculations (by his own admission, they're under attack) walking a mile consumes more fuel than driving a mile because of the intense use of fossil fuels in US agriculture and food transportation. He probably assumed worst case but still it's something to think about.
This is assuming that the person walking (or biking) is consuming extra calories to replace those used for transportation. That's an assumption I'm not willing to accept.
Or when viewed from the other side, this assumes that the person in the car consumes less calories because they are driving instead of walking or biking. That's even tougher for me to accept.