Interesting observation. But don't know of any structural differences between LX and EX to affect road noise. They have the same tires, which is a top contributor to road noise. From an audio standpoint, the LX has 6 speakers (160W) while the EX has 8 speakers (180W). But all Insight trim levels have the same number (2) of noise cancelling microphone points.The Insights are our first hybrid vehicles. Most likely won't be buying a 2021 as we keep vehicles for a while. Interestingly, the EX is a quieter driving vehicle as compared to the LX. Engine and road noise are noticeably less in the EX. Both my wife and I have noticed this. Is there different noise cancelling techniques involved with the 2020 model versus the 2019?