On limited access highways, the big cause of crashes is not speed, but difference in speed between slow and fast folk. Something like 85% of drivers will cluster about a speed , posted limits or no, because that is where that 85% are in their comfort zone. Driving outside that zone, high OR low, increases the odds of an accident.
Now, I don't know if that makes you "dangerous," but the odds indicate "more dangerous than if 41magsnub ran with the herd."