I just got back from the gas station where I filled two 5 gallon containers and put them in the back of the car. (2017 LX) I smelled some fumes so I opened the two rear windows at 55mph. Wow, the buffeting was so severe I thought someone put square tires on the car. It shook the mirror too. Try it and see if yours is the same. It will really get your attention. Opening the front windows a bit stopped the noise.