I try to keep right but I also practice what I call "lane inertia". If I pass someone on the left, and no one is directly behind me, I don't immediately jump back into the right hand lane. I'll stay in the left lane for maybe 10-15 seconds, to make sure that I'm not coming up on another car in the right hand lane I'm going to want to pass. If I do, I'll stay left and pass. If not, I'll move to the right.
So in short, I try to balance lane changes vs. lane cruising vs. going the speed I want to go. Many times I have to be in the left lane to maintain my cruise speed, but if I see someone coming up faster behind me I will move over when I safely can. If I can, I'll speed up to complete my pass, so I don't hold up anyone.
Another benefit to *not* holding up someone wanting to go faster than you: after letting them pass, you can use them as a rabbit!
I guess, in short, I don't see anything wrong with "cruising" in the passing lane, as long as you're passing slower traffic (or are coming up on slower traffic that you will be passing soon) and as long as no one else wants to pass you. Oftentimes staying in the passing lane reduces the amount of slowing down/speeding up/changing lanes you have to do, making for a smoother drive. This is also why it's sometimes called the "fast lane"... faster traffic is passing the slower traffic in the "slow lanes". When I'm in the left lane, I'll go as fast as road, safety and traffic conditions allow. If I can go the same speed in the right hand lane, or if I don't want to go at warp speed for whatever reason, I'll move over.
But, if you want to cruise at or below PSL, join all your slowpoke friends in the right hand lane, please. I'll wave to you when I pass you on the left.
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