I couldn't disagree more strongly :). I always adhere by "keep right except to pass" and it works fine. I also move into the left lane preemptively while approaching an on ramp to give any traffic entering the highway room to merge. I'll be honest, I usually set my cruise control about 10% over the speed limit, because I find I can minimize the number of times I have to change speed this way. Decelerating only to accelerate again wastes fuel so I do whatever I can to maintain a constant speed, but I also want to get there ASAP. So 10% over seems to be the sweet spot--sometimes I'm overtaking, sometimes I'm being overtaken, but I rarely have to disengage cruise.

EDIT: I also drive with two hands on the wheel, don't listen to the radio, and don't play with my phone.

Agreed, TBH on a quiet 4 line highway I'm in lane 2 to allow the ramp traffic easy on-off. I'll move left to pass if needed, but if there's someone going slower in the far lanes, I'll usually pass on the right to avoid moving over 3 lanes.