I like the comparisons to driving in Germany, as this is a really a stupid comparison. First off, many highways don’t have a speed limit in Germany. Its not uncommon to see someone driving well over 100 on the autobahn.
Second, until they can show me a law where it states that its legal to exceed the posted speed limit in order to “maintain the flow of traffic” I will then only drive in the right hand lane.
Third, they need to stop these idiots that pass on the shoulder, pass on the on/off ramp, and weave in and out of traffic.
Stick to the right lane if you are in CO.
While I can't quote the law here in Colorado, you are required to move to the right lane, even if you are traveling ABOVE the posted speed and someone moves up behind you wanting to pass.