I did not know that was a law? I thought that was suppose to be common courtesy... I think its illegal go to above the speed limit no matter what lane you are in so you can be going 60 if the speed limit is 60in the farthest left lane.
In California it most certainly is, and the California Highway Patrol *will* hand out tickets for "obstructing the flow of traffic" if you have people lined up behind you in the fast lane, and they occasionally make public statements to the effect of "even if you are going the speed limit, you should not stay in the fast lane."
They don't want to encourage speeders, but they know that statistically there are a lot of accidents caused by an impatient speeder on the tail of a self-righteous "I can be here because I'm going the speed limit" meat head.
This is also why in California you will see signs that say "Slower Traffic Keep Right" every few miles on rural Interstates.
I also know that in Holland and some other European Countries, you cannot drive in the fast lane *unless* you're *actively* passing someone: stay there for over a minute and you'll get a ticket!
It takes 15,000 nuts to hold a car together, but only one to spread it all over the highway,