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Lacking in MPG after nearly a year

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Smaltze, Feb 20, 2016.

  1. Smaltze

    Smaltze Senior Member

    Messages:
    172
    Likes Received:
    6
    Joined:
    Aug 13, 2015
    Location:
    london
    Your Mercedes:
    E320 S210 2002
    Ive had my S210 since early last year, when i first got it my best was 51 mpg on a long trip. it would shoot up to 40+ atleast easily on a not so long motorway commute. and easily 35-40 around town.

    Nowdays im honestly struggling to break 35 on the motorway with a feather foot, i hit 40 on a long commute the other day but its really nothing compared to it used to be.

    It was 1000 miles out of service due, and considering i have it remapped and given a hooning more than often i went ahead and serviced it, Oil, filter, fuel filter, and half a ATF change. Ive even just put a new water pump in so it should be healthy and happy at temperature. None of that seems to have made a difference though.

    I should mention that ive just had to let a bit of oil out of it because it gave a me warning on the motorway yesterday, but i havn't driven it since. I wouldnt have thought that was the cause though.

    I should also mention the mods - straight pipe exhaust, egr delete, remap

    Any ideas for me?

    Maybe give it a drink of that diesel engine cleaner product you can put in your fuel etc?
     
    Last edited: Feb 20, 2016
  2. nyx

    nyx Senior Member

    Messages:
    966
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    Joined:
    Dec 13, 2013
    Location:
    worthing
    Your Mercedes:
    w210 1998 e240 saloon
    wow. i only get 25mpg in town and 35 on a run on my e240. w210
     
  3. peterwhayward

    peterwhayward Senior Member

    Messages:
    865
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    3
    Joined:
    Oct 4, 2011
    Location:
    grays essex
    Your Mercedes:
    E240 classic est 2000 2.4
    Same here on my E240 2000
     
  4. turbopete

    turbopete Senior Member

    Messages:
    14,204
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    319
    Joined:
    Feb 4, 2009
    Location:
    Spennymoor
    Your Mercedes:
    2010 '60' Ford Mondeo 2.0TDCi Zetec (sorry)
    2 things. more power and using it whether you intend to or not, and check the engine temp. anything below around 85c is too low and the thermostat will need replaced

    EGR and CAt removal should be irrelevant, as far as noticing MPG changes goes
     
    Last edited: Feb 20, 2016
  5. OP
    Smaltze

    Smaltze Senior Member

    Messages:
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    6
    Joined:
    Aug 13, 2015
    Location:
    london
    Your Mercedes:
    E320 S210 2002
    the thing is i was still getting 45+ mpg easily even did another 50 after all the mods. have had them since last summer and it has only gotten worse over this winter
     
  6. turbopete

    turbopete Senior Member

    Messages:
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    319
    Joined:
    Feb 4, 2009
    Location:
    Spennymoor
    Your Mercedes:
    2010 '60' Ford Mondeo 2.0TDCi Zetec (sorry)
    assuming thermostat is ok, colder outside temps can also make a difference. on the run to work, my old 203 used to drop up to 3mpg in the frosty/snowy winter weather, and regain the 3 MPG during the summer
     
    Last edited: Feb 20, 2016
  7. OP
    Smaltze

    Smaltze Senior Member

    Messages:
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    Joined:
    Aug 13, 2015
    Location:
    london
    Your Mercedes:
    E320 S210 2002
    Where is the actual engine temperature display? Is it the coolant temperature display?
     
  8. turbopete

    turbopete Senior Member

    Messages:
    14,204
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    Joined:
    Feb 4, 2009
    Location:
    Spennymoor
    Your Mercedes:
    2010 '60' Ford Mondeo 2.0TDCi Zetec (sorry)
    yes the coolant temp.
     
  9. toby1

    toby1 Senior Member

    Messages:
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    Joined:
    Mar 13, 2007
    Location:
    West Berkshire
    Your Mercedes:
    1998 CL420 C140
    Mine is a saloon and that averages 37 MPG. I have seen 41 MPG on a motorway run and that's using the full tank to tank calculation and not the hopelessly inaccurate display.

    Yours sounds perfectly normal.
     
  10. OP
    Smaltze

    Smaltze Senior Member

    Messages:
    172
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    6
    Joined:
    Aug 13, 2015
    Location:
    london
    Your Mercedes:
    E320 S210 2002
    my display readings have always been consistent with my actual fuel usage. maybe ill check my tire psi etc. hmmm
     

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