You're right; however, I bet it still does better gas-wise than it's bigger brothers. All that weight doesn't help, but 20 mpg from a big, heavy car is not too shabby.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.