64 year-old Alan Thompson borrowed his friend Liz Moulton's Porsche Cayenne for the weekend, and as a thank you, returned the car with a full tank. The only problem? He filled it with gasoline, and the car takes diesel. Liz realized immediately there was something wrong with the car, so she took it to the dealership for repairs, who claimed repairs would cost $25,000. Fair price or vicious overcharging?