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

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post #1 of 23 (permalink) Old 12-25-2009, 03:04 AM Thread Starter
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Angry My experience with Blue (in)Efficiency

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 #2 of 23 (permalink) Old 12-25-2009, 04:22 AM
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Too short distance to make accurate comparisons. You should at least fill up at the same station with the same pistol and preferrably do it for a few fill-ups.

Are you sure you did not use the gas pedal the same way with both cars? I mean if you did, the 250CDI gave you a lot faster accelerations. Even if you tried to drive similarly, you might not do it.

The difference looks significant though (both compared to factory specs). Perhaps your 250CDI improves. Or does it have those problematic injectors still, I don't know if that can affect fuel consumption or do they just suddenly fail.
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post #3 of 23 (permalink) Old 12-25-2009, 10:39 AM
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I am not very familiar with the listed engines, but to my knowledge the blue technology is using more fuel because of some additional stuff on the engine.
The same way we do have California gasoline formula, that diluted with environmental stuff takes about 15% more to power the vehicle than the gas from other states.
Comparing new and old technology is pretty tricky.
In US recreational diesels are still using older engines and cdi technology still didn't make it to the industry. So I am comparing my 1972, 2-cycle Detroit diesel, that suppose was design in 1930's with similar size newer motorhomes. My makes 5.5 to 6 mpg, the newer less than 1 mile more. So much for 70 years of technology progress.
Than I compared my 1998 E300td with 2005 E320cdi. The latest offers pretty solid 20% fuel savings with way better acceleration to top it.
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post #4 of 23 (permalink) Old 12-25-2009, 01:55 PM Thread Starter
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- The distance is about 2x60km
- I did fill up in the same gas station, but I don't know anymore if it was the same pump.
- The 250Cdi accelerates a lot faster than the 220Cdi, but it is about 50km highway, with a 'steady' speed, so no or very less accelerations.
- The injectors have already been replaced. Maybe they need some break-in period ?

I'm realy not pleased with the fuel consumption, mainly because they promise it uses less...
Next week, I'll put my winter rimms/tires on the 250Cdi ( 16" - 205 tires ), so then I can realy compare, maybe it's because of the 18" - 255/235 AMG wheels...
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post #5 of 23 (permalink) Old 12-25-2009, 02:55 PM
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get ready for a statement retraction when your 16" wheels bump your mileage

just sayin
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post #6 of 23 (permalink) Old 12-26-2009, 04:16 AM Thread Starter
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To BlackOpalCDI,

What do you mean, I don't understand what you are saying...
You mean it will consume a lot less with the 16" wheels on it?
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post #7 of 23 (permalink) Old 12-26-2009, 07:04 AM
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16" wheels (and narrower tyres) would give better mileage but I assume the CO2 figure is from the registration documents, the 250 CDI would have even lower CO2 with standard equipment (including smaller tyres and specifically because of smaller tyres).
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post #8 of 23 (permalink) Old 12-26-2009, 08:57 AM
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Schoen you have to do more accurate comparison. While break in period might still be an issue, you have to compare the same situations.
For last few years I have the same 500 miles route I drive few times a year. Drive with the same speeds and VW Jetta tdi was making 32 mpg on it. The E320cdi was making 32 mpg as well. But having more than double hp in Mercedes the trip was taking me about 1/2 hr less. Would I do slow accelerations in E to match those in VW, I bet the mpg would be higher.
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post #9 of 23 (permalink) Old 12-26-2009, 02:13 PM
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Quote:
Originally Posted by schoenmaekers@hotmai View Post
To BlackOpalCDI,

What do you mean, I don't understand what you are saying...
You mean it will consume a lot less with the 16" wheels on it?
that is exactly what I mean

16" is much more energy eff. than a 18" plus green energy tires are not available for 18".. which makes the 16" an even better choice
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post #10 of 23 (permalink) Old 12-27-2009, 01:48 AM Thread Starter
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Quote:
Originally Posted by Diesel Benz View Post
16" wheels (and narrower tyres) would give better mileage but I assume the CO2 figure is from the registration documents, the 250 CDI would have even lower CO2 with standard equipment (including smaller tyres and specifically because of smaller tyres).
Yes, the CO2 figure comes from the registration document. It was measured with the 255/235 AMG wheels on it because they are also mentioned on the document.
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