That option wasn’t there when I checked after 44.5 updated a few days ago, but it was there this morning.
Drove about 150 miles today with majority being on highway and sorry to say but it did not make that much of a difference to me. Maybe cabin is about 5% quieter.
I turned it off and on about 20 different times through the trip.
I’m thinking this will improve over time with software updates.
At one point halfway thru the trip, I saw it say “calibariting” under where you turn it on off. That lasted about a few minutes, otherwise it says “optimized for front passengers”
FYI, I’m on Michelin all seasons so maybe the PS4s are quieter and will make more of a difference?