Bluetec Mileage - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 04-30-2007, 09:30 AM Thread Starter
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Thumbs down Bluetec Mileage

I bought the 07 E320 Bluetec - mileage is advertised at 27ish to 34mpg, 2 mpg lower than the CDI the prior year(s) because of the new catalysts for cleaner emissions.

I have 2,500 miles on mine and would like to share my mpg experience. The lower the average speed the better the mileage: 40mph for example will average easily over 31 to 32mpg up to over 34. The higher the average speed, 65 to 70mph, my mileage will sit at 29 mpg as it did for a recent 600 mile road trip.

My guess is the extra catalysts is creating too much back pressure at the 2000 to 2100 rpm (70+mph) and is crushing mileage. Surely the Germans don't think we can drive 55mph?!?
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post #2 of 11 (permalink) Old 04-30-2007, 09:43 AM
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what's the thumbs down for? You're right in the middle of the advertised fuel economy? It's not like they stated 45mpg and you're only getting 20...
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post #3 of 11 (permalink) Old 04-30-2007, 10:25 AM
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Take into account the fact the car only has 2500 miles. It's still breaking in. As you put more miles on it, you should see the mileage increase gradually.
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post #4 of 11 (permalink) Old 04-30-2007, 10:44 AM
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I agree that the engine is still breaking-in and mileage suppose to improve.
I've seen somewhere on youtube Bluetec cruising at 225 kph on autobahn. Wonder what was his mileage.
Remember that in Bugatti about 30 gallons tank last for 11 minutes at top speed.
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post #5 of 11 (permalink) Old 04-30-2007, 12:40 PM
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Also take into account that the EPA changed the way they test for fuel economy last year. This change has resulted in much lower advertised MPG ratings, but the ratings more accurately reflect people's real world experience as opposed to driving in a set of contrived circumstances that don't have much to do with real world use.
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post #6 of 11 (permalink) Old 04-30-2007, 01:50 PM
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Quote:
Originally Posted by spencersns
I bought the 07 E320 Bluetec - mileage is advertised at 27ish to 34mpg, 2 mpg lower than the CDI the prior year(s) because of the new catalysts for cleaner emissions.

I have 2,500 miles on mine and would like to share my mpg experience. The lower the average speed the better the mileage: 40mph for example will average easily over 31 to 32mpg up to over 34. The higher the average speed, 65 to 70mph, my mileage will sit at 29 mpg as it did for a recent 600 mile road trip.

My guess is the extra catalysts is creating too much back pressure at the 2000 to 2100 rpm (70+mph) and is crushing mileage. Surely the Germans don't think we can drive 55mph?!?
Germans themselves drive 155 mph with their equivalent CDI, the US speeds are nothing extraordinary to German engineers.

After brake in, the mileage difference between cars really comes a lot from the driver and the conditions, more than people normally accept for a difference when comparing experiences.

I would say 55 to 60 should be good for the mileage but you probably don't want to drive that slowly when the car does effortlessly a lot more.
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post #7 of 11 (permalink) Old 04-30-2007, 02:54 PM
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Maybe my actual experience with 93 2.5l diesel helps in understanding.
When my wife followed me in it behind motorhome at 70 MPH, the car was making regularly 35-36 MPG on over 1000 miles distance.
When I drove it with my regular 80+ MPH I never exceeded 28 MPG.
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post #8 of 11 (permalink) Old 04-30-2007, 04:33 PM
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In following with what another member already alluded to, the originally published EPA figures changed, and MB released a note to all dealers, followed by reprinted Monroney stickers with the correct estimate:

Old Values: 26 mpg city/37 mpg highway
New Values: 26 mpg city/35 mpg highway

of course it's an ESTIMATED value, given certain test conditions, etc., but the change wasn't considerable. I also would have to agree that perhaps it's a little early to judge, catalysts require at least 2000 miles or so to break in ... and then there's the rest of the to car to take into consideration.
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post #9 of 11 (permalink) Old 04-30-2007, 05:14 PM
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When my wife followed me in it behind motorhome at 70 MPH, the car was making regularly 35-36 MPG on over 1000 miles distance.
When I drove it with my regular 80+ MPH I never exceeded 28 MPG.[/QUOTE]

Great mileage but how close was your wife following you in the motorhome. The motorhome pushes a lot of air. So, if you are following close enough, your carisn't working as hard...it's kind of like drafting.
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post #10 of 11 (permalink) Old 04-30-2007, 05:21 PM
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Quote:
Originally Posted by jlomon
Also take into account that the EPA changed the way they test for fuel economy last year. This change has resulted in much lower advertised MPG ratings, but the ratings more accurately reflect people's real world experience as opposed to driving in a set of contrived circumstances that don't have much to do with real world use.
It hasn't changed yet - that happens next year, i.e. 2008.
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