about my milage: i had about 158,000 before i left and now have over 161,000 on the car. about smoother ride at higher speed, i agree and also have to say that the tires sort of balance themselves. after stopping for a night and starting to drive again the tires were rather off balance. i guess sitting for just 1 night is enough to make the ride pretty rough for about 5-10 mins of speeds @ around 80 MPH. after that short period of time, the tires seemed to balance themselves! that suprised me. anyway, overall, the LS IS the ULTIMATE road trip car and will always be.