The only thing different about this particular event for me was that it happened on the second drive, the engine should have still been decently warm. It wasn't the first ICE engagement of the second drive either.I was going to say that any Insight owner can reproduce what we are describing here by following my daily routine. It mirrors your experience. I start my car, back out of driveway and drive by one small house to the end of my side street, all in EV mode. I pull out on main road, go maybe 100ft and get into a left hand turn lane to do a uturn. The engine normally turns on while pulling out and is in the increased idle condition for warm up while waiting for the uturn. This is when I feel the vibration. If the HV battery happens to be in a good state of charge, the engine may not turn on until I do the uturn, at which point, I don’t notice the vibration since I’m traveling down the road, although I do notice a louder engine then normal for the amount of acceleration I’m doing. Perhaps cooler temperatures increases the amount of time the vibration is noticeable since the engine does take longer to warm up, which may explain why some haven’t noticed it before. It’s only noticeable in that short warm up time frame. If you don’t stop during that phase, you won’t feel it.
My personal take is it’s something that can’t/won’t be fixed. Since it only happens in that short timeframe, I’m not worried about it. It’s the nature of the beast. 99% of the time, it’s smooth as silk, so I’m happy.