 Treehugger | Boat-Tailed Car Boosts Mileage By 15% AOL Autos (blog) Darin Cosgrove's special Pontiac Firefly can get up to 64-mpg. Attaching a boat tail to the car greatly improves its aerodynamics, transforming it into a ... Guy Adds Boat Tail to Car, Increases MPG by 15.1% |