Tailgating is stupid at any speed so I do not do it ever. I am more calm driving on the highway than just about any other time these days.
As to the rest of what you said, no. Hell no.
Around town, I creep around slowly, often under the posted speed limit. Because no matter what one drives or how good a driver one is, or how alert one is, a kid can run out from behind a tree or parked car at any time, along with dozens of other totally unpredictable things. There is no safe way to drive fast on local streets.
But on trips on highways, I generally save way more than 2-4 minutes. I am not slowing down because you think 80 is a reasonable speed. I will, very calmly, pass you and, if necessary, weave my way around you if you are hanging out in the left lane regardless of your chosen speed. It’s quite rare for people to pass me on the highway, but I still am considerate of those few people who might wish to drive faster than I and I never camp out in the left lane.
You can have you opinion about what speed other people should limit themselves to. But you cannot actually control what other people do. So all you are doing is increasing the danger that might be posed by faster drivers. That much you DO have control over.