Yes, there are a couple of long (~5 mile ) hills at 8% or 9% and I will often go up them at about 45 mph if I am not holding anyone back. And coasting is my favorite gear. No need to brake, as the car is generating when it is simply coasting.
I have a volunteer radio gig on alternate Fridays and I make the ~27 mile drive home late at tight at mostly 45mph (deer and bears, again) and have gotten 50 mph on the trip home.