interesting. I too noticed the kids being driven around town, while my friends and I took the road bike and a rickshaw (we built it) and walked around. I'm sure we walked at least 3 miles, across dozens of blocks. The rickshaw gave people a chance to take a break from walking, and it held all our cans for the foodbank (trick or canning anyone?).
....although I've been driving to work instead of biking, but I think that's cause I don't get sleep anymore thanks to school. Still averaging the same, 20-21mpg intown.