Only some roadways have limitations. The GS Parkway and the NJ Turnpike have lane restrictions for trucks and buses to stay right. Towing speed is 55.
I change lanes frequently to stay to the right. I often outpace those who just stay in the two left lanes.
On a 2 or three lane Ill keep darting to the right - I like to stay clear of faster traffic,
On a 4 lane if there is no traffic Ill stay to the right, but I cant remember when that happened.
I wont move right just to slam on the brakes to keep rear ending a truck going 24 MPH slower for someone who has 2 clear lanes to the left.