[dcb]

the energy consumption should be proportional to the amount of air diverted. The vehicle skin charge should not need a lot of current to maintain, but as new air hits the vehicle it will need to be ionized for maximum force (plus some drag for the ionizing interface). Not sure if/how to make a win out of it but it is an interesting idea, some links would help.

Of practical concern, you don't want sparky sparky while refueling at the gas pump.