While the data you cite is correct, this seems to include the entire working population. I'd be willing to bet that the average office worker has a much longer

While the data you cite is correct, this seems to include the entire working population. I'd be willing to bet that the average office worker has a much longer commute than the average worker. For example, I suspect the average waiter or retail working isn't going to favor a far away location over something close to them. They all probably offer similar compensation and work environments. However, a white collar worker is more likely to take a faraway job if it pays well.