I seem to recall some speculation that Honda might supress the engine a bit for the first 1000km /600 miles to aid 'running in' . Or was this theory discounted as nonsense? Possibly it just loosens up and revs more freely by this mileage when the car automatically tops up the HV battery, or the driver subconsciously makes more use of revs at the noisier end of the scale.
I think I noticed my car was slightly noisier by this mileage, but it might just my imagination as I was expecting some change. I didnt notice any noticeable improvement in performance and thought if Honda had deliberately supressed the engine to protect it for 1000 km , why not just leave it at those settings all the time.
Is it possible the apparent improvement in performance is in reality because you are getting about the same performance more quietly using fewer engine revs ?