This is why I look at the actual reviews, like the one that shows this in a real world scenario.
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But you are correct, when I've driven my wifes MY, I've never gotten 300+ miles of range. It may have something to do with me driving 80+ mph. I also don't get 20mpg in my Kia compared to the 25mpg sticker.
I'm guessing for actual city gridlock block to block driving it's definitely over 300. The thing is nobody ever needs 300 mile range for that kind of driving.
Last week I had to drive my PHEV 30 miles round trip all block to block in LA because they highways were hell. It took me 90 minutes and Im only supposed to get 18 miles EV range but I still had a charge when I got back and the hybrid engine never kicked in. The EV range was nearly double listed for that horrible 90 minutes/30 miles.