I think it's the wrong type of publicity. You'd either have reckless drivers stranded on the side of the road (bad publicity), or hypermilers being passed by every other car on the road (bad publicity).
What we need to show off is how much fun and how nice these cars are to drive, not the extents you need to go to in order to stretch the range. You may be proud of driving in the cold/heat, 5 miles below the speed limit to get 50 miles on battery, but the general public will take it the wrong way.