W163 320 - poor mpg - where to start?

Discussion in 'General Discussion' started by allias, Mar 29, 2015.

  1. allias

    allias Active Member

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    Afternoon

    Could you please give me few pointers as where to start to try to reduce fuel consumtion?

    I did few tests recently and I get ~17 in city and ~22 on motorway. Considering that my 320 pertol got "only" 102k miles that seems to be a bit high. I have recently swaped tyres and reduced size (not because of mpg) to Conti and have done service (MB Genuine oil).

    I know next point of call would be:
    - fuel filter
    - spark plugs

    Is there anything else to check on those what might bring few miles back? Anything else that would make a difference? Tyre pressure is fine. :D
    I want to plan things to do in one go.

    Yes I know removing brick from my shoes is the main thing :rock:
     
  2. gIzzE

    gIzzE MB Enthusiast

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    Seriously? What were you expecting to get?


    Official figures...

    Urban mpg 15.5 mpg
    Extra Urban mpg 25.2 mpg
    Average mpg 20.5 mpg

    You're beating them, so think you're doing well.
     
  3. V12

    V12 MB Enthusiast

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    Reduced tyre size? Bad idea...

    Good luck beating those figures in a 320 ML.
     
  4. flango

    flango Hardcore MB Enthusiast

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    Mine did better than that the pile of carp it was, used to just nudge 20mpg if SWMBO used it around town on her commute and if I used it on mine 90% motorway 80 mile commute it was just shy of 26mpg
     
  5. bobmedley

    bobmedley Active Member

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    I drove two ML320's for 100k miles in total and averaged 22mpg (accurate as I had to keep records for tax reasons, so always calculated brim to brim).

    It was a curious engine (a bit like the W164 ML350 I had afterwards) inasmuch that no matter how slowly I drove it never bettered 22 mpg.

    Don't know if LPG is advisable, but that is probably the only thing you can do.
     
  6. gIzzE

    gIzzE MB Enthusiast

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    When you say reduced tyre size, what do you mean?

    I would go to a 235 width and then make sure it is a the correct rolling radius.

    Also, a tyre like the goodyear effcientgrip will give better MPG figures, but not talking a great deal.

    Going from 275 to 255 to 235 will probably give you 1mpg more each time, and then a very economical tyre like the efficentgrip another 1mpg.
     
  7. OP
    OP
    allias

    allias Active Member

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    Thanks to you all... all that just made me clam about "fuel performace".

    I had 275/55-17 and I have gone to 255/65-17 as that what I had as spare set. It feels a big more responsive but that compromized a grip. Still all good as it mostly driven by missis to drop or pick-up kids at nursery.

    Knowing my figures are fine I will just continue enjoying it :)
     
  8. V12

    V12 MB Enthusiast

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    Have you checked actual values of MAF and Lambda sensors?
    Depending on the year it will have either 2 or 4 lambda sensors.

    These sensors can adjust the fuel correction and leave the car running rich without flagging the check engine light.
     
  9. OP
    OP
    allias

    allias Active Member

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    V12 - do you know figures I should be looking for?
     
  10. grober

    grober MB Master

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    That tyre change will result in a change in tyre circumference from 2214.59 to 2302.06mm this is a change of 87.47mm or 3.95%. this will mean your mpg figures will be slightly out
    Car Bibles : The Wheel and Tyre Bible
     
  11. Benplym

    Benplym Active Member

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    I pretty much never went past 16-17 city driving in my w163 270 diesel. It's a huuuuuuge car to shift from a standstill and its a petrol. I'm returning 19 average in the ml280 w164 City driving and that's pretty careful driving.
     

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