For comparison, yesterday I drove 75 miles at 55mph or under, arrived home with 15 "Nissan miles" remaining, with 2 bars of SOC remaining, all in ECO. TED shows 18.8kWh went back into the batteries after that run. That gave me about 7.5 miles per SOC bar. Higher than average, but I was driving VERY carefully.
That was my first 55mph run on the highway because I knew I would need maximum distance to do what I wanted (I usually do 60-65mph). I was quite pleased with the range....based on the entire trip, I feel the the 15 "Nissan Miles Remaining" number was very accurate. The big question is is at what point would turtle-mode activate and how far could I go under turtle? One of these days, I'll do exactly that under closely monitored circumstances.