Yuck. That'd make me think twice about pulling over next time.
I obey the speed limit not for saving fuel but because I cannot afford a speeding ticket and insurance rate hike. I can save fuel at any speed (well, maybe not in my Buick).
I mostly don't pull over. If people are willing to risk an expensive speeding ticket, they should be willing to risk a relatively inexpensive illegal pass ticket. The roads where I usually drive are empty enough that safe passing is very easy.
There is one spot where I pull over,
if someone is not tailgating me. If they're tailgating I just go slower and don't pull over. Let them complain to the police or their legislator, maybe the unreasonable speed limit on that road will be raised or maybe traffic enforcement will be there to nab them for tailgating (that'll never happen).
I feel your pain. There's not much we can do about it.
If you drive the same roads at the same time every day then the traffic will eventually get to know you, and if passing is possible they will learn to pass. This has happened on the road where I pull over. Lately when I pull over they don't dawdle anymore, they just pass immediately, I don't even have to come to a stop. There's a couple spots that are especially easy and safe for passing without me stopping, and I regularly get passed in those spots. The other day I got passed by 5 cars at once on this usually empty country road.
If you're willing to draw attention, add a message to your back window either encouraging a pass or telling them to write their legislator for higher speed limits. I'm not so I don't...I already draw too much attention with my old car and slow driving as it is.
You could complain to the police. They may send someone to enforce traffic laws. However, if they're anything like the police around here, they'll never enforce any laws that actually have to do with safety and courtesy, only laws that are great for revenue generation - speeding, mostly. Even that could work if people get the idea that the road is heavily enforced.
You could complain to your local legislator. If you can rally up enough support, maybe the speed limit can be raised to match the prevailing speed. Is California one of those states with a law saying that the speed limit must be related to the actual speed that most drivers are driving? Looks like yes:
http://www.ibiblio.org/rdu/ca-speed.html
Edit: Holy crap, sorry about the encyclopedia-length post. This is a sore issue for me.