Agreed. The minimum speed for interstate-class highways should be 60 MPH. If you can't do 60, take the country roads.
> And there are other deleterious effects of 120mph. > 100 and most consumer tires are at their brink. Similarly, there is a lack of the average vehicle to accelerate quickly beyond 80.
This is why highways have multiple lanes. Slower traffic to the outside, faster traffic to the inside. If your vehicle isn't capable of keeping up with the fastest traffic, stay to the outside.
Unfortunately Americans in particular are horrible at lane discipline, something I believe is aggravated by speed limits being too low so there's a subset of idiots who take it upon themselves to be speed enforcement and drive slowly in the passing lane.