[knutsp]

I think that the road (wheel) noise around 30 mph in EV mode is the most noticeable. I have to problem with the noise level, road or wind, on motorways, no more than most other cars, including my previous car as new.

New or worn asphalt surface makes the biggest difference, though.

I have read the tyres a specially selected for ECO driving, and may be also the recommended tyre pressure?

The Ioniq is by far not most silent one to get. (Rolls Royce Phantom VIII is probably.) The engine (ICE) is described by some reviewers as a bit noisy at high revolutions. More insulation means more weight and volume. And a more silent engine would mean a bigger one, with more sylinders, I guess.

I have a feeling the absence of a running ICE at low speeds may increase my sensitivity to the road noise. Not sure.