The Trump administration says the rollback will free carmakers from regulations that have kept them from producing more affordable vehicles. California, said Trump’s Environmental Protection Agency chief, Scott Pruitt, “shouldn’t and can’t dictate to the rest of the country what these levels are going to be.” We often disagree with Pruitt, but here he has a point. If California wants to enforce tougher fuel efficiency standards, by all means, Sacramento, be our guest. But not as a mandate affecting drivers in Illinois and other states.