Originally Posted by holew
Mercedes offers 5 or more diesel engines for cars in the UK. Here is the MB UK website address for the C-Class autos:
You will have to use the PULL DOWN to select the 220 diesel since the web address opens with the 180 gas engine and the 200 diesel already selected.
The 220 twin turbo diesel is one of the diesels available in the UK. It is a 2148cc engine rated at 170hp. The MPG numbers for this engine in a C-Class sedan are astonishing. 47.1 mpg for the Urban Cycle (city), 68.9 mpg for the Extra Urban (highway), and 58.9 mpg combined. Additionally the performance listed is 0-62MPH = 8.1 sec with top speed 144mph.
If these MPG numbers represent the real world I would think that MB could not keep up with demand if they were available in the USA.
Does anyone know how reliable the European MPG posted numbers are in relation to what is actually attainable?
Recall in the USA when the gov't first required the posting of MPG numbers the gov't mandated test resulted in overly optimistic numbers which has since been corrected.
This is my first post on this forum. I might not know how to get back to it. So if you like you can also send me your comments at
I am very interested in understanding more about the reliability of European MPG testing.
It's a UK site so if you haven't adjusted from Imperial gallons to US gallons divide by 1.2.
The European NEDC tests are easier so multiply by 83% to get a rough-and-ready NEDC to EPA conversion.
The combined figures are different in the NEDC test to: I believe it's 40/60 or 45/55 compared to the EPA 55/45 city/highway balance.
Then, remember that the EPA cycles are tougher so meeting the emissions standard (now the same amount for particulates between EPA Tier 2 Bin 5 and Euro 6) is harder in the USA which means more aggressive emissions controls, which further hurts mileage.
Also, I believe the diesel fuel in Europe may allow for slightly higher engine efficiency.
(The USA has very tough NOx emissions standards but MB uses SCR so it doesn't hurt mileage although you'll pay a little extra per mile for the AdBlue urea solution (and a lot more if you're a sucker and pay the dealership for it.))
47.1 mpg ~=> 32.6 mpg
68.9 mpg ~=> 47.7 mpg
So, EPA 55%/45% city/highway combined may be 38.0 mpg, but then you may expect worse because of more fuel burned for emissions reduction.