Jason attempts to sell the car he bought in an earlier episode for a profit.Jonny Smith sees how fast the vegetable oil powered Mercedes-Benz from a previous episode can go.Tom drives the new Mazda MX-5 Roadster Coupe, a hard-top convertible.Previous winners of the giveaway cars are announced.Tiff visits visits Mercedes-Benz World, the biggest car dealership in the country, and test drives Mercedes’ newest and most powerful 4×4, the ML 63 AMG.Tim Lovejoy goes banger racing with comedian Alan Davies.Vicki drives the new Porsche 911 GT3.