I don't know but limos are maybe the moxt luxurious cars ever!
President Obama will get a new Custom built 2009 Cadillac Presidential Limousine manufactured by General Motors. It has an executive compartment having a mobile office and also ample seating space.
It is built like a tank. It is even termed as rocket resistent, chemical weapons resistant and high velocity bullet resistant. The windows are also bullet proof and the car keeps rolling even if the tires go flat. The price of the car has not been disclosed by the official sources. However, the car is estimated to be of millions of dollars.