[el ess A]

HP ratings from the factory are unlikely to change unless there was a business advantage to do so. Look at the printed advertising that would instantly go obsolete if it does. Dropping a PS pump isn't worth the change in printing costs. Now, if they got those 50+ HP back, then I bet it would happen.

The advertised ratings, as they've always been, are just that. Real world ratings, as they've always been, are subject to change a little.

I don't know of any legal requirements surrounding this, but I'm guessing a percentage plus or minus from advertised ratings is allowable.