I have to admit, driving in to work today was a breeze. I could even slalom lanes, hypermiling-style*, without worry of impeding anyone else.
Taking the shortest path on s-curves, so the closest thing one can get to a straight line, while remaining on the road. Effectively changing lanes to the innermost lane every time the road curves in the other direction. I don't really expect to save gas, I just do it because it keeps my mind on the road, and I don't do it if there's anyone else about.