Quote:
Originally Posted by DslBnz
A W124 with a 603 barely burns any, in my experience (about 31 mpg at 80 mph). The combination of the large frontal area, the extra weight, significantly poorer aerodynamics, and the 2.88 differential does not bode well for efficiency. But it is an S-Class,...What the heck. 
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Yep, they're considerably better than the W126 with the same engine. I'll bet that top speed in a W124 is at least 10mph faster as well.