E250 fuel consumption

Discussion in 'Parts, Maintenance & Servicing' started by MercedesEnthusiast, Feb 11, 2019.

  1. MercedesEnthusiast

    MercedesEnthusiast Member

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    Hi all,

    I'm a bit concerned with my MPG. I have a W212 late 2012 and can't believe the MPG I get, in slow moving traffic it's returning about 17MPG and on long journey on motorway the best I got was 37MPG and didn't even put the foot down. I do believe something isn't right but I would appreciate if anyone can tell how much they get out of their w212.

    Thanks
     
  2. m2287

    m2287 Hardcore MB Enthusiast

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    What kind of speed do you do? In my c250 if I go 80 I get 42ish mpg and that’s on a run, 70 gets 55mpg easily.
     
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  3. gIzzE

    gIzzE MB Club Veteran

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    I had the E350 S212 estate, and I used to get 26mpg in traffic coming out of London, averaged 30mpg and would see 36mpg on the motorway (could nudge 40mpg if sat at 70mph).

    Depends what slow moving traffic is?
    Everytime you are sat still you're doing 0mpg, so if you are sat at lights etc. a lot you could drop to 17mpg I suppose.

    Is your car getting to 90ºc quickly and sticking there no matter what you do?
     
    MikeInWimbledon likes this.
  4. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    Mostly speed limit but sometimes a lot of traffic. For instance about 2 hours ago I just went out on a 5 mile journey including return home on a very heavy traffic and returned 17MPG which seems extremely excessive. I could barely get 10 MPH but the MPG seems really poor.
     
  5. gIzzE

    gIzzE MB Club Veteran

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    Just realised you have a 250 cdi.

    Mine was the 3.5 litre petrol.

    Definitely check your thermostats.

    How many miles do you do when sat in traffic?
     
  6. gIzzE

    gIzzE MB Club Veteran

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    So how long did it take you to do 5 miles?

    If it is taking 30-40 minutes then 17mpg sounds perfectly believable, if a little annoying.
    5 miles is not really enough for a diesel to get up to temperature, but should get there within 20 minutes even in traffic.
    If your thermostats are not working properly the car will think it is cold and over fuel.

    You need to test them before doing anything else.
     
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  7. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    Yes, my car goes to 90 degrees quickly and remains there. But on a full tank, I'm not even doing 400 miles, roughly 360 - 370 which doesn't seem right to me. I was thinking if there's an issue as my rev has a little play, 100 RPMs up and down but seen lots of W212 with speedy RMP.
     
  8. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    My car gets to 90 in roughly 5 mins and the thermostats have been changed, been plugged into star and no errors at all.
     
  9. Daveuk

    Daveuk Hardcore MB Enthusiast

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    My E250 doesn’t get to 90 that quick can take it 15mins before it gets that hot.

    I do a 50 mile commute A roads and motorway anything between 48-60mpg depends on the right foot and sitting around 65-68mph on motorway makes a big difference.

    Driving round town does knock it down though think I’m half way through a tank and I reset trip when I filled it and it’s around 48mpg at moment I can get 500-550 before fuel light comes on.


    Sent from my iPhone using Tapatalk
     
  10. clk320x

    clk320x MB Club Veteran

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    Something is wrong, my E250 gets 53-58mpg on average motorway/a-road and some town. I have got 64mpg through 50mph roadworks.

    Fuelly shows I get around 615 miles per tank and theres 5 litres left in the tank normally when I fill up (55l tank)
     
    Last edited: Feb 11, 2019
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  11. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    Wow, nice figures. I'm getting more worried now. You do 500 - 550 before light comes on and I do 300 before my light gets on. What might be wrong?
     
  12. MercedesDriver

    MercedesDriver Hardcore MB Enthusiast

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  13. Daveuk

    Daveuk Hardcore MB Enthusiast

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    I wouldn’t know to be honest. When was it last serviced and by whom? Any smell of burning from the brakes at all when you stop?


    Sent from my iPhone using Tapatalk
     
  14. MercedesDriver

    MercedesDriver Hardcore MB Enthusiast

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    Probably nothing is wrong if thermostat is changed, brakes are not sticking and Star showed no faults. You can’t compare stop-start traffic with driving on a motorway or A-B roads. If it takes you let’s say 45-60 minutes for 5 miles 17mpg is to be expected.
     
  15. Greenmanslk

    Greenmanslk Hardcore MB Enthusiast

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    Is that 17mpg calculated on a tank to tank refill? Or from the onboard dash display which is notoriously rubbish.
     
  16. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    It's from the display but I know how many miles I do with a full tank. Please check the attachment and you can see where my fuel gauge is and how much it reckons I do with the remaining fuel. It seems excessive.
     

    Attached Files:

  17. MercedesDriver

    MercedesDriver Hardcore MB Enthusiast

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    You have traveled 3 miles in 51 minutes with average speed of 4mph, of course you will have such high fuel consumtion.
     
  18. gIzzE

    gIzzE MB Club Veteran

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    ^ Exactly this. ^

    If you were doing 30mpg, the speed limit, it would take you 6 minutes.
    That means out of you 51 minute journey you are sat for 45 minutes doing 0mpg.
    This is obviously going to ruin your average.

    14mpg and 3 miles per 50 minutes means you are getting to spend 4 1/2 hours in your car per gallon, I only manage around 15 minutes in mine for a gallon. So if you think of it as cost per minute you are doing far better than most of us. ;)
     
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  19. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    Well in this instance I'd say yes you're right. However, the others seem to report they're doing between 50 - 55MPG on motorway, and never seen more than 37 on mine on a 50 mile journey
     
  20. clk320x

    clk320x MB Club Veteran

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    This is mine on motorway and a-roads, with a small amount of town driving too.
    [​IMG]

    Here’s mine 50mph on an a- road
    [​IMG]
     
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