I will not open that door again. The great "if an HD Radio plays in the woods, and nobody is there to hear it, does it make a noise" argument. All joking aside, HD Radio doesn't have the reach that would be viable to constitute being equal of an analog FM signal.
I can hear WZLX HD2 almost to the Cape (Plymouth) and west to Worcester. Further then I hear WRKO with the noise floor today. WXKS HD-2 just as far of course I can hear WBZ-AM further but. Many of these improved HD signals are blasting out today now that most are on their main antennas and running the newer legal limits. Most of the new cars today come with them. I know there are exceptions but more new cars have them than don't.