I've seen two claims for the Nissan Leaf's drag coefficient:
0.28:
Nissan Leaf offers much more than zero-emission driving - egmCarTech
0.29:
"Nissan Leaf EV: First drive" by Maynard's Garage
Do a search and these two figures are repeated around the internet.
Fairly unimpressive, considering the average new car sold today is about a 0.29-0.30.
They need to roll out a sub 0.20 Cd car with their next model line, which would dramatically improve range without adding much to the cost. Trying to go after small gains such as changing the shape of the headlights, when much larger gains can be found by modifying the car's rear end, just doesn't make much sense...