Here in New Orleans:
many (if not the overwhelming majority) of private drivers treat any given posted speed limit as a MINIMUM speed of traverse...
...truckers seem to treat it as the speed at which they'll bother recognizing that you're on the road...
...and native-born Asians treat it as something to be feared and never ever approached, which is why they tend to drive about 15mph UNDER the speed limit all the friggin' time!!!
That's not racism folks, that's just a plain fact of this (and from what I've heard, quite a few other) locales
As for me:
I tend to do whatever the flow of traffic is doing... and I seem to be one of the few who'll stay the @$%^!# out of the Left Lane unless I'm actually passing or exceeding the speed limit.