NO..I HAD NO IDEA gas engine started/stopped while doing 60mph on hwy flat road...I thought it was a Tesla without the poor quality.
This is a steady state, no brakes regenerating (though I wish there was an icon when I engage that separate system-without killing myself or car behind me), no gas pedal burying wide speed varying ride where you can go about 10 mi at 61-70. a/c on or off, cruise control on or off, lights on or off. SOMETHING parasitic this way comes AND GOES, and I've done nothing to provoke it. I had two riders who noticed how the car had a sudden, rumbly vibration, mostly through the seat/floor/chassis. While we know our other car, a RAV4 2022 Hybrid, isn't QUITE THE SAME.....you are right, you gotta be there-and good luck w. getting a service mgr. to take a 12 mile hwy. rida and hope it comes up.
The Prius Prime is a 3 year old car w. 11K miles, and it runs extremely smoothly (if a little louder in road noise isolation limits), but this....well, it just suddenly turns from butter to econobox slogger, as it a "cheap ride" automatic damper came on for those missing their Prius C.. The steering doesn't shimmy, the road has no apparent change in material or condition and it goes away...soo who cares? Well, we do, as the Prime is a little bit of "movin on up" and the beans ain't supposed to burn on the pan or Prius suddenly fry on the grille...it is too nice a ride in action not to notice when it goes a bit choppy sloppy, Jeckyll and Prius?