Premier Date: November 10, 2004
When a car engine was dropped from the boom lift it barely even wobbled, much less catapulted Buster. In an attempt to duplicate the myth result, the boom lift was converted into a trebuchet, mounted on several shipping containers to give it clearance to rotate. On its first throw, it threw Buster at a steep angle towards the ground, and then collapsed between the containers, destroying it.
Tests were performed under varying conditions (55 mph versus 45 mph). The 55 mph test used a computer to estimate fuel efficiency based on air intake, not actual fuel consumption, and showed A/C was more efficient. The 45 mph test consisted of running the tank until it was empty, and showed open windows were more efficient.
*Because the original tests were inconclusive, this "urban puzzle" was revisited in episode 38: It is more fuel efficient to use air conditioning when the car is traveling approximately 50mph or more. Otherwise, windows are more fuel efficient.