2013 Jaguar XFR-S Spied
When Jaguar takes a car out to test run, they usually mask it under plastic, fabric, or other kinds of camouflage. By when a super-secret vehicle like their concept XFR-S supercharged sedan needs to be kept under wraps, they mask the entire test vehicle within another car. This is typically referred to as a "mule" car.
The drivetrain and engine of a test vehicle is placed in an existing model. For XFR-S, Jaguar used the…