Dealer can't figure it out.
After 75MPH, it feels like the car is "humming"
Tires, wheels, balancing, & alignment have been double-checked
TSB for 1500 RPM Drone was also, initiated
It's actually, a light vibration, which emanates from the undercarriage, through my steering wheel
I have an '05TL/Auto, with 19,500 milles
Any insight is greatly appreciated
It's driving me nuts
P.S. My EL42's, were replaced with the Newer version, at 9900, miles

 

EL 42's will always suck. many memebers can vouch that the new ones are still junk and you should invest in better tires if you live where it rains or snows frequently.