Poor MPG

Discussion in 'Tech/Mech General' started by OddSocks, May 27, 2014.

  1. OddSocks

    OddSocks Read Only Funster

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    I was expecting better. Not millions but just better than this!

    1990 Mercedes 208D 2.3l - 21.8 MPG for the last few tanks.

    I have been trying to drive sensibly! Not going over 60mph. OK, lots of hills in Devon and Cornwall need 3rd or even 2nd gear at times...... but seriously! Under 22 MPG?

    Am I expecting too much, or does this sound a little low to you?

    BTW - I tried the premium fuel. Made no difference. Felt like a I had a bit more power, but the exact same MPG I got with standard diesel.

    ETA: There is an after market turbo and inter cooler in it - could that be the culprit?
     
    Last edited: May 27, 2014
  2. Les

    Les Funster

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    I had 208d non Turbo go any where "SLOWLY" up hills 25mpg
     
  3. Wildman

    Wildman Read Only Funster

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    my 508d only managed 17mpg I'd guess 22mpg about right for an older Merc. My sprinter based Merc does 24mpg, your van is lighter so maybe you should be getting a bit more but not a lot.
     
  4. cmcardle75

    cmcardle75 Read Only Funster

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    Sounds right to me. Mine gets 10mpg (on propane). That makes it about the same cost to run per mile as yours.
     
  5. Terry

    Terry Funster

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    22 mpg Sounds about right to me :thumb: you won't find many vans doing much more than 25 mpg with a big bump on there heads :Wink: The turbo will help increase the mpg simply with the increase in torque IE not having to change gears as much and being able to leave it in the higher gear for longer
    terry
     
  6. longdog

    longdog Funster

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    I had an '56 plate CI Cipro 55 on a Mercedes Sprinter base with the Sprintshift 'box. Driving like a nun I was averaging 20mpg worked out on mileage and reading at the pumps.

    Now I have an '09 Ace Adventurer 635EK with a FIAT 130 multi jet motor. I am averaging just over 25mpg or 25.2mpg if you want to be pedantic. Ironic when you consider the Ace has a Luton body too.

    My old Hymer Swing with a FIAT 2.8jtd was more economical than the Merc and the Hymer had a Luton body too.

    I think the Merc is just plain thirsty to be honest.
     
  7. Wildbill

    Wildbill Funster

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  8. OddSocks

    OddSocks Read Only Funster

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    Thank you everyone. Being new to all this I just don't know what to expect.

    I will keep tinkering with different fuels and additives and see if we can't tweak another couple of m's per g! :)
     
  9. Wildbill

    Wildbill Funster

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    maybe take it for a tune up that may help get you another 2/3 mls PG
    maybe the pump is running to rich get soume one to have a look
     
  10. Terry

    Terry Funster

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    :BigGrin: slow down to 50 mph that will give you a couple more mpg :Smile:or do some free wheeling down those big Cornish hills :BigGrin:
    terry
     
  11. joner8888

    joner8888 Read Only Funster

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    It`s a wind problem--

    Last year i drove 65 miles down the M5 in a 45 mph headwind and averaged 10MPG--foot on the floor :Eeek:

    On the return journey x2 days later ,the wind was still there ,45 +mph tailwind and averaged almost 35 MPG

    A motor home has a slipstream coefficient value the same as a side of a warehouse.

    It hurts when you travel to a site in a headwind ,then have a headwind on return :cry:
     
  12. chaser

    chaser Funster

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    Had the van version of this, didn't do any more mpg than yours and you've got a bigger body on yours
     
  13. pappajohn

    pappajohn Funster Life Member

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    tweak away....but you wont get it.

    All this rubbish about super duper fuels is just that....rubbish.

    All they have is more additives to burn cleaner and increased cetane.



    How Does Cetane Number Affect Engine Performance?

    Just as there is no benefit to using gasoline with an octane rating higher than recommended for a specific engine by its manufacturer[HI], using diesel fuel with a higher cetane rating than is required for a particular diesel engine design yields no bonuses[/HI]. Cetane number requirements depend mainly on engine design, size, speed of operation and load variations--and to a slightly lesser extent, atmospheric conditions. Conversely, running a diesel engine on fuel with a lower than recommended cetane number can result in rough operation (noise and vibration), low power output, excessive deposits and wear, and hard starting.


    Regular diesel has a cetane number of 48....premium is 55.
    Your engine was not designed for premium diesel......and was probably built before premium diesel was thought of.
     
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  14. emmitdb

    emmitdb Funster

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    Greetings,

    I've not tried this with the 'van yet (Hobby 650 2.8 Fiat lump) as it's all too new (getting 27+ at the mo!!!)
    But,
    when I was tugging I put in 250ml of 2 stroke oil in a tank of 70Lts of an Audi 2.5 Tdi. I swore it made it run better. One things certain, the 2 stroke won't hurt it. Give it a try. The Audi has 165000 on the clock and is as sweet as.

    Regards
     
  15. TheDogMan

    TheDogMan Funster

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    I have a 3litre manual Hobby and drive at 60 - 65 mph using cruise as much as possible,I get between 18 and 23 acording to the wind speed & direction, if the 200l water tanks full or if I have my trailer on, the variable's are endless, I have give up checking it now :Doh:
     
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  16. Sidney

    Sidney Funster

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    I remember a couple of posts back the OP was given guidance on chip fat :Blush:

    I believe that fuel efficiency is something that has to be put to one side when owning and driving a coach built or a-class MH.

    Perhaps a day van or larger van conversion gives better MPG?
     
  17. davejen

    davejen Funster

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    I put 2 stroke oil in my sprinter-based Autotrail, haven't actually checked mpg yet but recentlly done348 miles (full tank) and still have 1/4 tank left. We are away next Sunday so will fill-up and check mpg then. Ireckon on 20+. Thats with sprintshift g/box and using cruise as much as poss.
    I also think the engine seems to run smoother and quieter too, got the tip via a Land Rover forum a while back. In a test (in the US I think) they compared loads of additives and 2st gave about 7percent increase in mpg, others did nothing and a few were better, unfortunately I can't remember the best performing ones!

    Cheers, Dave:thumb:

    ps, thats with a toad too
     
    Last edited: May 27, 2014
  18. Portland

    Portland Funster

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    Hi, I ran these Mercs as luton delivery vans and they returned 15/17 mpg local deliveries and 18/20 on long runs. I took them to various tuners but to no effect. Don't waste money on Premium fuel it will make no difference. :thumb:
     
  19. lee52

    lee52 Funster

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    I dont even want to think what MPG I will get with a 26yr old 6.7 cummins with a 6ton brick for aerodynamics
     
  20. scotjimland

    scotjimland Funster Life Member

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    I can tell you.. about 12 mpg :Laughing:

    I had the 5.9lt Cummins in my RV pushing 8.5tons , it did about 12 mpg .. maybe 14 on a good day downhill with a tail wind .. :Smile:

    I stopped working it out, too depressing .. just fill it up, 70 gals worth and enjoy the drive.
     
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