I can confirm my Nissan Leaf is also noisy at 60-70mph. Here are my dBs test results
So, basically you say this:
In summary, Nissan Leaf is not as quiet as you may think, and it is not just my perception! It actually is quite noisy on motorways and certain city road surfaces.
From what I see on your page, I take it as..
When the noise from outside is loud enough to be louder than an ICE engine (driving fast, bad road, rain, etc), then the Leaf is as loud as an ICE car..
To me, that's exactly as quiet as I might think... That's kind of what I would expect..
But good to see the numbers to back it up..