Is 58 MPH in a 55 MPH zone fast enough to justify using the passing lane?
Maybe it depends on where you live, but there are places where the posted maximum speed is taken seriously. I wouldn't take the right to speed for granted everywhere. I had a friend who was ticketed for going 32 mph in a 30 mph zone, in Texas of all places.
Not to if anyone behind you ! We all need to drive like the Germans. Pass quick and get it over with. Look behind you before grabbing the passing lane for a low speed pass.
Not if you'd be holding other people up who are going faster and trying to pass.
If you're passing, sure.
No. That would take awhile, it's practically riding side by side.
If they're actively passing another vehicle, yes, if just hanging out there, no.
I allow 10mph more in the left lane on a two lane highway and 15 if three or more lanes only in the far left lane