Ridge Riding

I've been checking out some hypermiling groups. I've always been somewhat fascinated with hypermiling, but I'm not trying it, and I'm not driving the speed limit to save on gas. One technique someone suggested in one of the groups to avoid people getting angry with you is ridge riding. The basic idea is sto sit on the white line on the edge of the road. There are some reasons why it will help you get better mileage and might make people think you are having trouble and feel sorry for you instead of angry. But it seems to be best left to the highway (where I have the least trouble with angry drivers). On the narrow roads I drive to work, there doesn't seem to be a ridge to ride most of the way.