Hennessey Performance has broken its own unofficial record for the fastest speed achieved by a car with a decorated Christmas tree on the roof. The sports car tuner has been making the Christmas Tree Run for the past few years and hit 192 mph this year with a Ford Mustang Shelby GT500 that was equipped with Hennessey Venom 1000 package, which boosted its horsepower from 760 hp to 1,000 hp.
