Something like this perhaps ? SoundScreen® | Acoustic Windshield | CarliteI think there's some film you can put on the windshield and even your windows in general that will help cut down on the noise at high speeds. Might be worth looking into. Just make sure if serious about getting it done that you go to a good installer.
65 mph = 104.60736 kph.... I drive at 70mph, constantly get passed, but I don't get tickets, stay out of the #1, #2 lanes, most importantly, don't have that much road noise!100 km is somewhere around 60 to 70 mph. Somehow our buick changed us to km as we were on the interstate. And in keeping up with traffic, my average speed was about 100 km.