My experience with Blue (in)Efficiency - Page 2 - Mercedes-Benz Forum

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post #11 of 23 (permalink) Old 12-27-2009, 09:12 AM
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Quote:
Originally Posted by schoenmaekers@hotmai View Post

I have 2 mercedes cars:
-C220 Cdi Break of 2002 ( 225.000km, 5 speed automatic, 205 16" tires, 197g CO2/km.)
-E250 Cdi Coupé Blue Efficiency ( 7000km, 5 speed automatic, 235/255 18" tires - AMG pack, 163g CO2/km.)
I don't see how you can claim that Mercedes-Benz is lying (very strong words) about their new cars when you are comparing two completely different models. I would never think they are saying the E-class would get better mileage than a smaller engined, lighter car, a C-class, as you seem to believe. I would assume they mean an E-class with BlueTec gets better economy than a same year and optioned E-class without BlueTec. Am I mistaken?

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post #12 of 23 (permalink) Old 12-27-2009, 10:54 AM
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Originally Posted by DirectLA View Post
I would assume they mean an E-class with BlueTec gets better economy than a same year and optioned E-class without BlueTec. Am I mistaken?
Yes you are (wrong).
Bluetec has listed like 1 or 2 mpg less than 320cdi and owners report even bigger difference in real life. Than Bluatec offers 9 more hp. Might not seem much, but it is almost 5% increase while 1 mpg is 3% increase,
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post #13 of 23 (permalink) Old 12-28-2009, 01:43 AM Thread Starter
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Quote:
Originally Posted by DirectLA View Post
I don't see how you can claim that Mercedes-Benz is lying (very strong words) about their new cars when you are comparing two completely different models. I would never think they are saying the E-class would get better mileage than a smaller engined, lighter car, a C-class, as you seem to believe. I would assume they mean an E-class with BlueTec gets better economy than a same year and optioned E-class without BlueTec. Am I mistaken?
I started this thread by giving the CO2 figures which are on the registration documents.
The 7 year old 220cdi break says 197g CO2/km, for the new 250cdi coupé it says 163g CO2/km.
So this is Mercedes saying: the new one consumes less than the 7-year old one

About the engine size, the 220 and the 250 are both 4-cylinder, +- 2150cc engines.

And don't get me wrong, this new coupé IS a fantastic car to drive !!
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post #14 of 23 (permalink) Old 12-28-2009, 09:02 AM
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I understand my mistake, thank you gentlemen. I am curious if your "bluetec" fluid reservoir is perhaps empty causing the decrease in fuel efficiency? Doesn't it need topped off at 10,000 miles or so? Just a thought.

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post #15 of 23 (permalink) Old 12-28-2009, 09:21 AM
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The 250 CDI is a "Blue Efficiency" model, no urea injection. Is there any fuel consumption effect if the "bluetec fluid" has exhausted, this stuff is injected to the exhaust system to improve emissions, I thought the engine should not be aware of it (except that the engine may be turned to limp-home-mode or something to force the owner to fill up, to get emissions right)?
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post #16 of 23 (permalink) Old 01-10-2010, 03:53 AM Thread Starter
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With the 16" 205 wheels it now consumes a little less then the C Break. So I think the fuel consumption was caused by:
- The "big" wheels.
- My driving style, which was not exactly the same as with my C break.

But it takes a lot of discipline to drive it calm ;-)
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post #17 of 23 (permalink) Old 01-10-2010, 01:15 PM
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S-mäkers:

Aren't we confusing two issues, fuel consumption and emissions? Are the emissions, as measured on your 250, lower or greater than on your 220. Not theoretical averages, please...

As for the fuel consumption, it is related only to the weight, equipment and efficiency of each unit, not the emissions results.

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post #18 of 23 (permalink) Old 01-10-2010, 03:10 PM
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S-mäkers:

Aren't we confusing two issues, fuel consumption and emissions? Are the emissions, as measured on your 250, lower or greater than on your 220. Not theoretical averages, please...

As for the fuel consumption, it is related only to the weight, equipment and efficiency of each unit, not the emissions results.

Cheers,

CO2 emissions and fuel consumption are directly related. CO2 emissions can be calculated by the fuel type used (carbon content) and the amount fuel used (e.g. mpg). For modern vehicles there is virtually no unburned fuel out the exhaust so determining CO2 emissions is easy. Likewise, knowing the CO2 emissions/mile of a of a car and the fuel used, it is easy to calculate the mpg for the vehicle.


By the way. diesel fuel has a higher carbon content than gasoline, so burning diesel give a slightly higher CO2 emissions/gal than gasoline. So for two cars that get the same mpg, one diesel, one gasoline, the gasoline vehicle will have a lower CO2 emissions/mile. Fortunetly diesels have a much higher thermal efficiency and higher BTU/gal so it more than offsets the higher carbon content/gallon.

Now other emissions, NOx, etc need to be measured not calculated.


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post #19 of 23 (permalink) Old 07-30-2010, 08:44 AM
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hey just bought the 220 CDI and it gave me around 18 Kms to the litre ..fairly fuel efficient i thought

Quote:
Originally Posted by schoenmaekers@hotmai View Post
Hi All,

I have 2 mercedes cars:
-C220 Cdi Break of 2002 ( 225.000km, 5 speed automatic, 205 16" tires, 197g CO2/km.)
-E250 Cdi Coupé Blue Efficiency ( 7000km, 5 speed automatic, 235/255 18" tires - AMG pack, 163g CO2/km.)

As you can see in the specs the new one should be much cleaner and consume less diesel.

I rode one week with the old one and 1 week with the new one, the same trip, same speeds, more or less the same traffic density.

With my 9 year old MB, I had to fuel up at 720km, then I can fill 50L in the tank.
With Blue Efficeincy, I had to fuel up at 700km, then I can fill 55L in the tank.

So the old one is on paper the dirtiest one, but in real life the new one is the most consuming vehicule.

Mercedes is lying about the new cars which consume (according to them ) less fuel !!!
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post #20 of 23 (permalink) Old 07-30-2010, 01:22 PM
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hey just bought the 220 CDI and it gave me around 18 Kms to the litre ..fairly fuel efficient i thought
This must be some sort of an average at Indian traffic? Once your car is well broken in and if try decent speeds at highways, you would get still quite a lot better mileage. For varying traffic 18 km/litre is good, equals 5.55 litres per 100 km. The lowest figure I've had with my 221 is 6 litres/100 km (that is steady, decent and pretty constant speed on a highway).
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