tires are out balance or may have bad cv joint
Normally when you have a vibration at two levels, it is the wheels are out of balance on the front.
65mph is faster (100km/h = 62.1mph).
55.4 seconds per mile at 65mph
15mi/65MPH = .23 hr = 13.9 minutes.
65mph
around 65mph
65mph ==
+65mph
65mph
bout 65mph
About one hour at 65mph
65MPH