I piloted the Volt for the first significant time today. We did a 42 mile drive, 39 miles of which were highway at between 65mph and 75mph. Drove in D, not L, with the A/C set to ECO; two of us in the car. Did 38.2 miles EV and 3.8 miles on gasoline. Might have been able to do the whole thing EV with a little less speed and the added regen from L mode.