Sweating the body details

Extensive wind-tunnel work gave Volt a shape that's slicker than it looks. But engineers aren't happy with the curb weight.

Advanced powertrain engineers and eco-enthusiasts argue convincingly that Volt's technology crown jewel is its electrified propulsion system. And they're right. But the car's overall efficiency, and success in the marketplace, also hinges on its aerodynamics, styling, package efficiency, and occupant protection.

The body form and construction count as much for electrified vehicles as it does for conventionally powered ones, perhaps even more. Witness Toyota's Prius, whose overall wedge shape and tall greenhouse make it far from a handsome car. But that look struck a major chord with hybrid early adopters and cemented it to the point that Honda paid homage with the current-generation Insight.