It would appear you are right. From the MPAA WikiDGSimo wrote:PG-13 rating still allows nudity as long as it's non-sexual and not explicit so FURY ROAD could be ok.
So, breasts that are shown in a non-sexual way (and apparently regardless of how much is shown or much screen-time they have) are subject to a PG-13 only. Never knew that. So yeah, FR should be okay in that regard.A brief scene of nudity (non-sexual) will require a PG rating. More than a brief nudity (non-sexual) will require a PG-13 rating
As for violence, the MPAA is pretty lax on that. I just saw Captain America: Winter Soldier this past weekend and it was pretty violent. Easily an 'R' back in the old days.