Panoz's years-long vision of an arrow-shaped road car is finally coalescing into something tangible. The automaker has unveiled a real-world concept version of the car, the DeltaWing GT, that shows that the idea isn't far-fetched. Despite Panoz's ambitions, it doesn't have the lowest drag you can get in a car (even a Mercedes CLA250 sedan is slicker). However, the company previously promised highway efficiency of 74 miles per gallon or more -- this could be one of the few gas-powered sports cars that doesn't require frequent top-ups. There's still a huge gap between this and a production-quality DeltaWing that you could drive around town, but the prototype represents a crucial step forward.