The estimated EV range matched pretty much what I actually got (with super light foot). It did degrade that badly. Did several measurements to double-check and usually was within 1-2 mile of the estimate. I was able to get 30 mile at beginning, after 5 years only about 24-25. And that's in CA weather so not too much cold temps. Unfortunately I think bad design since when I checked that Sonata shutoff behavior online, I noticed other people experiencing the same issue. Perhaps fixed since then, this was their first PHEV model I believe. I remember Wayne mentioning that the Hyundai Sonata is using diff tech where they are able to use more of the battery capacity than other manufacturs (less reserved capacity). But can't remember details, I think they can do a deep charge. I did have better experience with Honda Accord PHEV. Also I expect Toyota to be much better experience.