Driving in the left lane

[Cato]

From wiki:

Common practice and most law on United States Highways is that the left lane is reserved for passing and faster moving traffic, and that traffic using the left lane must yield to traffic wishing to overtake. The United States Uniform Vehicle Code states:

Upon all roadways any vehicle proceeding at less than the normal speed of traffic at the time and place and under the conditions then existing shall be driven in the right-hand lane then available for traffic ...

The Massachusetts Institute of Technology's website on "Keep Right Laws" points out that:

This law refers to the "normal" speed of traffic, not the "legal" speed of traffic. The 60 MPH driver in a 55 MPH zone where everybody else is going 65 MPH must move right...

http://en.wikipedia.org/wiki/Passing_lane

In other words, unless you are passing another vehicle place your tortoise paced ass in the right lane.