Personally I haven't had any trouble with speed limit Right lane. Yesterday and today I was lucky enough to safely follow a Walmart truck going about 60 in a 75 and 65MPH limit.

I've driven for efficiency for 26 months and never had a single instance of anyone who looked angry. That is exept for two days in a row when I placed a 65MPG sticker on my rear bumper. Thought I was going to get shot or something.
I removed the sticker and wall-ah, once again no trouble.

I'm in the far right lane going about the speed limit and 99.9% of traffic slowly passes me by. Sure people follow at a close distance and if they get tired of it just go around with courtesy. Never had a single time been "cut off" or anything like that.
I occasionally pass people but isn't very often.

Often times someone will follow me at a safe distance for 10-20 miles before passing or exiting.

I would never use the carpool lanes in either my HCH or our Grand Caravan. Just don't want to waste the fuel.
Everyone here know and most follow the "Slower traffic keeps Right" rule so the lane to my Left is a little faster, the lane next to him etc etc.

Carpool lanes are the fastest Left most lane and crazy.

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT