As promised, I recorded a video of driving my Insight. Video was driving home from getting some groceries. Speed limit was ~35 most of the trip, traffic was low and I caught all of the lights. I live by the lake, which is around 200ft lower elevation, so the mileage you're seeing is partly from going downhill during the last ~1.5 miles. Outside temp was also 53F which has a small but measureable negative impact on economy.
It occurs to me it would be a much better video if I narrated, might do another with that, but you'll see soon enough if you get one.