Yeah the cdi is rated 37 highway....quite a bit better. Plus it has the mega torque (nearly 350ft/lbs) which is awesome. 
New MB's already have traction control on the rear drive....what need is there for all wheel drive unless you are regularly scaling mountain passes covered in 2 ft of snow and ice?
If I ever buy a "newer diesel" it will probably be a sprinter anyways. With dually rear tires for extra traction and towing/payload capacity.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
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'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
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