I tend to get better range than that, I'd like to claim it is my driving style, but more realistically it is because I live in Southern California so the battery is generally at ideal temperature, I often don't need heat/AC, and probably most importantly I'm not sure if I have ever driven 70+ mph for 300 consecutive miles without hitting traffic.

Also when I do road trips, I'll tend to do multiple shorter stops which according to that link means I'm closer to the "optimum charging area" than going 10%-80% in one sitting, so that might have caused me to overshoot that estimate a little.

So beyond that slight amendment of switching that one ~30 minute charging stop to two ~15 minute stops, the answer to ketzo's question is "yes, really", but as the saying goes, your mileage may vary.