Re: Vibration in steering wheel
Most vibration issues reported here involve tire balance or wheel issues. This is with the 20 inch wheel and in a speed range of 65-75 mph.
If you're confident that they checked balance and the wheels are true the next thing to look at would be the drivetrain U and CV joints and wheel bearings.
Transmission? Possible but I'd rule out the above first. Do you drive in ECO mode in that speed range? If so, turn it off and see if the vibration goes away.