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Thread: Not happy with mpg

  1. #1
    Regular Member gaz1965's Avatar
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    Vehicle : Vectra C

    Trim : SRI 150

    Engine : 1.9 CDTI

    Year : 2007

    Default Not happy with mpg

    Hi all as said above. I have a 1.9 cdti 150. On my journey to work today which is through traffic as well a dual carriageway my average mpg was showing as 23 mpg. Not happy at all I wasn't driving her hard. I have noticed it getting gradually worse lately. She has been serviced recently and she drived lovely. Any ideas? Oh she was registered on 12/06/07 does anyone know if I have the updated swirl bar?
    Thanks
    Gaz

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

    Default

    It will have missed the new manifold by about 7weeks I wreckon.

  3. #3
    Regular Member shinyb1's Avatar
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    the dpf could of been doing a regen , my mpg drops when mine does it .

  4. #4
    Regular Member CH-VECTRA-ELITE's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : CDTI 150 (Z19 DTH)

    Year : 2006

    Mileage : 140000

    Default

    The weather, it's cold so the engine takes a little longer to warm up so mpg will be bad until car is warm, you have the heaters on to keep you warm, your lights are on more than normal. My MPG which in the summer was sitting around 47-49 has dropped to 43-44, and that's after a regen. I'm putting down to the cold weather.

  5. #5
    Regular Member gaz1965's Avatar
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    Vehicle : Vectra C

    Trim : SRI 150

    Engine : 1.9 CDTI

    Year : 2007

    Default

    Thanks guys. Excuse my ignorance but whats a regen? :-p

  6. #6
    Regular Member chewy71's Avatar
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    Quote Originally Posted by gaz1965 View Post
    Thanks guys. Excuse my ignorance but whats a regen? :-p
    Only have a DPF if you have a Signum or an estate so looking at your avatar (Hatch) this won't affect you. Mpg drops in the winter months but 23 seem about 50% of what you should be achieving.
    Check tyre pressures and simple things first. Make sure your air filter has been replaced and not clogged up with small leaves.

  7. #7
    Regular Member gaz1965's Avatar
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    Vehicle : Vectra C

    Trim : SRI 150

    Engine : 1.9 CDTI

    Year : 2007

    Default

    Thanks Chewy had a service about 2000 miles ago. Would cleaning the egr valve halp?

  8. #8
    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

    Default

    Does your car get warm (temp needle) and stay over 85 degrees. THis cold weather shows up a lot of failed thermostats which if failed open as they do - will mean you are running the cold map a lot longer.

  9. #9
    Regular Member gaz1965's Avatar
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    Vehicle : Vectra C

    Trim : SRI 150

    Engine : 1.9 CDTI

    Year : 2007

    Default

    I reckon its that because she takes ages to warm up and the temp usually stays below 85

  10. #10
    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

    Default

    It will be then.

    The car should warm at stay around 86 - 90 degrees regardless of driving.

    New thermostat comes in a complete housing and includes the CTS.

    Ideal time to flush the coolant aswell.

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