Did the $29.99 Nitrogen special at a dealer close to work. Definitely can tell the ride is smoother on my 20" RFTs. I also did the MPG on the BC on the way home and highway I got 20.5 (no a/c on and just me) at 70 MPH--I was only able to get 19.5 max before so maybe a little better MPG. Tire pressure keeping longer and tire longevity TBD.