The EPA rated full charge at 4.2v. Reducing voltage at 100% is changing the EPA rating without the EPA's consent. Illegal.
You hit the nail on the head here. Tesla is changing the EPA rating after sale. VW did this and was sued to high heaven, the news called it "dieselgate" and the punishments for post-sale EPA mileage adjustments in software are, precedence wise, extremely severe. Tesla is returning the voltage before an EPA investigation forces them to buy back cars like they made VW do. Changes to teh EPA's pre-sale ratings are taken seriously and it would be incredibly ironic for Tesla to be handed a dieselgate conviction. The EPA absolutely will not allow companies to cheat their official EPA tested numbers.
I agree 100%, I was chastised by members on this board for comparing this to dieselgate. Look where we are now.