I just jumped up to the raptor 2 days ago. With an average of 862/900 on fico auto 8 the lowest I could get was 4.89. I wouldn't be surprised if you can get a bit lower with navy federal and a 850+ score. Some people can get various member loyalty bonuses as well which is worth checking on and can potentially hell you dip below 4.5. I don't believe you're getting better than that right now.
I ended up settling for a 5.25 dealer option just for the convenience.