I purchased a 2015 EX AWD in April 2018 with 26,000 miles to replace a 2009 EX totaled in a black ice accident. In October, when it starts getting cool in South Central Pennsylvania, i noticed a vibration in the seat between 40-50 mph at 1100 RPM - traveling on flat roads. I found after a wed search TSB 15 046 that describes a repair to my problem exactly. Does anyone have any experience with this repair? Did it solve the vibration issue? Did it affect gas mileage?