Pacific Northwest - OR,WA,BC

It's a matter of personal independence and speed. If I'm at a gas station to fill up then I'm not making progress in getting where I want to be going. I know what grade of gas I want put in my car, I know how the pumps operate, and I can generally fuel my car faster than going through the back-and-forth process of dealing with an attendant. Of course, I've also only lived in places where self-service was the norm, so I'm very used to pumping my own gas. Whenever I drive down to visit my sister in Portland I always try to fill up across the river in Washington just so I don't have to deal with the mandatory full-service in Oregon.