I was most certainly driving a "Passenger Vehicle" which states under the law that it any speed over 55+ mph for passenger vehicle.
Quoting That Guy
Here, I found another law which is for right lane only.
Maximum Speed for Designated Vehicles
22406. No person may drive any of the following vehicles on a highway
at a speed in excess of 55 miles per hour:
(b) A passenger vehicle or bus drawing any other vehicle.
Driving at the minimum at 55mph.
A person driving at less than the normal speed of traffic
shall drive in the right-hand lane for traffic or as close as
practicable to the right-hand edge or curb.
Veh. Code §21654(a)