Every vehicle I've ever had, regardless of transmission, had a one-rpm drone on the highway. Set the cruise to 70 and it basically does what it does unless its enough of a hill to force a down-shift.
Also this is why I lost my taste for loud exhaust years ago.
Except in the case of a really loud exhaust (and poorly tuned with the noise peak at the wrong RPM), I haven't experienced a drone on the highway. That's because the engine is under minimal load at steady state speed (and other outside noises at highway speeds (e.g. wind, tire, etc) drown that out anyway). It's a very different scenario during acceleration in stop and go traffic, where the engine is constantly under load while accelerating from each stop sign/light, and is far noisier droning at a fixed RPM. That noise is more prominent in stop and go because the outside noises (wind, tire, road, etc) are largely non-existent when pulling away from stop signs or traffic lights.
The CVT I drove was just like every other car at steady state on the highway. Driving in stop-and-go traffic with CVT was noisy with the engine under load as it accelerates from each stop and it was a constant drone (not crazy loud in a stock/new Honda, but still annoying and not pleasant). Accelerating on the highway in the CVT (rather than steady state), say from 60 to 70, was noisy and very sluggish compared to a conventional multi-speed automatic.
Just curious if you have you driven a CVT? I think there was one post on this thread from somebody saying it was okay, but the rest of the posts on CVT experience were pretty negative.
There is no question CVT maintaining optimal RPM should be superior on paper -- haven't seen that borne out in real life. One reason they drive poorly is that the optimal RPM for fuel efficiency is often very far from the optimal RPM for power -- so it drones all the time under load, but also feels weak on acceleration because it if fixed at the efficiency RPM. That matches my experience in the car.
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