Yes, the 6 minutes per mile thing seemed weird to me. I live and work in SF now, but I used to work in Santa Clara, and I would do the drive in about 40 minutes -- just about 1 minute per mile. I drove at non-peak times, and my off-highway time was usually no more than about 10 minutes.
Then I started working in San Mateo... half the distance, but usually 25-30 minutes. Off-highway time increased, and on-highway decreased. Still, though, a far cry from 6 min/mile.
But I'm so much happier now that my commute involves only 6 blocks of walking and a 20 minute bus ride. I can even read on the bus! It's great, though the lack of control over my transportation still bothers me.