2011 Silverado 1500 Crewcab Rear Seat Seatback Angle
 

Does anyone know what the rear seat seatback angle is on the 2011 Silverado 1500 Crewcab or where I might be able to find it? The 2011 Toyota Tundra Double cab boasts a "generous" 22-degree rear seat seatback angle. I presume that the angle is measured from vertical (if the rear seat were completely vertical, then tilted back 22-degrees). I'm just comparing some features of the two trucks. Thanks in advance for any feedback.