Ahh, I never understood the length/height ratio before. Thanks!
The hybrid battery is fan cooled through the luggage compartment inside the car. Late model lithium batteries have low internal resistance. This makes them run much cooler than previous batteries. I am not very knowledgeable in aerodynamics, but I understand batteries relatively well.
Oh, speaking of hybrids, the electric system has far less power available than the engine. So, any drag reduction should be more noticeable in a hybrid than a standard gas only vehicle (unless my logic is somehow flawed).
Matt