Real world MPG - 350 CGI vs 500 vs E63

Discussion in 'General Discussion' started by Londonscottish, Feb 27, 2017.

  1. SW18

    SW18 Hardcore MB Enthusiast

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  2. gIzzE

    gIzzE MB Club Veteran

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  3. Fudger

    Fudger Hardcore MB Enthusiast

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    Real world E63 motorway mileage MPG

    This is from Sunday when I took a trip from Woking to Nantwich and back.

    M25/M40/M42/M6.

    Over the last 5k miles, I am at 21mpg but that includes quite a bit of town driving and stop start commuting.
     

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    Last edited: Mar 23, 2017
  4. cezar

    cezar Member

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    Guys I know it’s old but need a piece of advice. Very curious about the fuel economy on a W212 350 CGI MY2009. I see numbers everywhere that are far from what I’m getting. I totally understand it depends on lots of factors but my cars shows for the last 4000 km (roughly 2500 miles) an average of 11.9 l/100km ( roughly 20 MPG). And that’s with 50% of on highways, 40% on busy A/B roads and 10% city. As for the driving style was as per the roads and no trying to save fuel. Anyway it looks to high if I read your numbers around here.

    Another thing, don’t know if relevant, while driving around 50 km/h just I just reset the trip and let the car go with no press on the pedal. It starts at 9.4 l/100 km (roughly 25 MPG) when it should be the minimum ever.

    I know this is not a car to save fuel but just curious and wanna make sure all’s ok.

    P. S. Running on 18 inch wheels if that makes a difference.
     
  5. gIzzE

    gIzzE MB Club Veteran

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    First, it is getting to 90ºc on the thermostat and staying there no matter what you do, ie hills, traffic etc.?
     
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  6. SW18

    SW18 Hardcore MB Enthusiast

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    I’ve just been in the EU in mine and switched the instrument display to metric, and it showed my long-term economy of 26.5mpg as 10.6l/100km. So only 10% different from what you are getting. I do most of my mileage on highways and quiet A or B roads. So you’re probably doing ok.

    If I reset the trip at the start of a long motorway journey and leave it, by the end of the trip I’m usually below 10l/100km and very occasionally below 9l/100km if it’s a long trip (over 300 or 400km) and the traffic has been light.

    Be aware that hills make a big difference and we don’t have many of them on our UK motorways.
     
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  7. cezar

    cezar Member

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    I’d say yes but have to admit never checked it constantly (will try to have a look from now on)

    for me there’s quite hilly roads (A/B). Not high but plenty of ups and downs.

    today on a 360 km from plane reaction to hilly side (40 km on highway, 100 km on B roads and the rest A roads but mostly small cities in and out and lots of overtaking) I made around 12 l/100km. The idea is that I’ve never seen those small number you guys are throwing here. If I mind my foot I could go as close to 10’ish l/100km.

    for example this is a short trip in normal big city traffic.
     

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  8. cezar

    cezar Member

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    That’s strange. Maybe it has to do with conversion formula! Are there more mpg numbers?
     

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  9. SW18

    SW18 Hardcore MB Enthusiast

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    Yes that would be about normal for me too, I get about 15l/100km in city traffic.

    Yes! A UK gallon is 20% bigger than a US one. I think this is why you’re seeing a difference to the figures on here!
    US gallon = 3.79 litres
    UK gallon = 4.54 litres
     
    Last edited: Aug 28, 2019
  10. cezar

    cezar Member

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    :wallbash: 4972C0AF-0951-4F5E-BEBB-4815813AD32B.jpeg

    Should’ve done my research :eek:
    But at least I learned something new. I thought it’s enough to have miles, which them are several already; never thought of “more” gallons :wallbash:
     
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  11. cezar

    cezar Member

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    But this numbers are still far for real world (like any car maker “best” numbers I think)

    527A7F85-AA54-4D12-907D-BCBFBC5A0869.jpeg
     
  12. cezar

    cezar Member

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    just checked today an the temp is stable @90 degrees ;)
     
  13. gIzzE

    gIzzE MB Club Veteran

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    I used to use 9 L/100km from my E350 3.5 petrol as an average.

    8 L/100km on a run.

    The 10km cold start we used to do every day for the school run I used to get 10 L/100km, which was better than the E350cdi it replace, which would get around 11L/100km.

    If you do lots of sub 20km journeys the diesels average is ruined as they take around 20km to get up to temperature, until that point they are seriously over fuelling.

    Remember that 6.6 L/100km official figure is from a car up to temperature already, getting up to 70kmh and then slowing to around 50kmh over 10km to average 50kmh.

    So get your car up to temperature, set tyre pressures to around 2.4bar front and 2.6 rear and then cruise at 50kmh and reset your OBC and see what you get after 10km.
     
    Last edited: Aug 29, 2019
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  14. cezar

    cezar Member

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    i know it's been a long time but here's the feedback. in the end it can go very low in terms of consumption, not that this is what this engine is for though

    got a 6.8l/100km over less than 10km. kind of flat road.

    other than that it stays roughly around 10-11'ish driving as you need

    IMG_6432.jpeg
     
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