I've noticed a slight increase in road noise, but I had to turn off the stereo to hear it. As for gas consumption - my in town consumption went up, and my highway consumption went down (and this is after compensating for the change in the speedo readings due to the larger tire diameter). My hypothesis is that the added weight of the Nittos significantly increases the inertia to start rolling from a stand-still, so stop-and-start driving really eats the gas - and I have definitely noticed a loss in pep off the starting line (I love the high-torque jack-rabbit starts so it was pretty apparent to me). While the larger diameter improves the gear ratio for highway-speed driving.