The ROUSH F-150 Liquid Propane Injection truck is designed and manufactured to operate solely on propane while providing the same horsepower, torque and drivability of an F-150 equipped with a gasoline-powered 5.4-liter, 3-valve Triton™ V-8 engine. ROUSH has begun taking orders for the propane-powered F-150. The 2008 model year truck can be ordered, delivered and serviced through a nationwide network of select Ford dealers.