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Thread: OBC 6mpg out not amused

  1. #1
    Regular Member philsh's Avatar
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    Vehicle : Vectra

    Trim : SRI SAT NAV

    Engine : 2.2

    Year : 2006

    Mileage : 82000

    Default OBC 6mpg out not amused

    My obc is telling major lies as its saying i'm getting 36mpg at the min but i've just done a test and purely doing town driving i've just worked it out at 30.89mpg. On £30 I did 151.1miles at 134.9 per litre. Tbh i'm very disappointed in that figure as was expecting 6mpg more as thats what the car said i was getting. am i over reacing in being disappointed as it is all town driving. Most of it is driving from prescot to anfield and prescot to kirkby. No motorways inc in that either well the way i go.

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    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

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    From a 1.8 seems ok.

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    Regular Member Ben50n's Avatar
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    Have you had the car mapped? I understand this can affect the OBC?

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    In my 2.2dti I'm getting around the 29-30 mpg mark on my 4 mile round trip commute so I'm not to happy but guess that's life sat at lights and on a busy ring road twice a day start stop constantly with the engine not even getting warm

  5. #5
    Regular Member philsh's Avatar
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    Vehicle : Vectra

    Trim : SRI SAT NAV

    Engine : 2.2

    Year : 2006

    Mileage : 82000

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    As far as i no its not been mapped. I just thought it seems abit low thats all. If a diesel is only gettin 29-30mpg and people have said seems ok i'll shut my trap and be happy lol

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    Mapping if done properly, is not noted for causing this. A box, on the other hand, does.

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    I know there is nothing wrong as normal use when warm it's about 40mpg and on a run I'm doing 55-60 easy so it's just the fact I'm doing short journeys from cold and stop start constantly which sounds similar to you.

  8. #8
    Regular Member philsh's Avatar
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    Vehicle : Vectra

    Trim : SRI SAT NAV

    Engine : 2.2

    Year : 2006

    Mileage : 82000

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    Yeah thats it just short trips and not getting warm.

  9. #9
    Regular Member renodci's Avatar
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    My OBC gives about a 20% over-reading; which is lucky because I've 'cured' it by changing the settings to US Gallons (which are 20% smaller than UK). It's now pretty much spot on; no idea why it was so far out when set correctly though.

  10. #10
    Regular Member chewy71's Avatar
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    I went for 52mpg to 59mp with remap on towns and A road,.. my partners 150 SRI is getting 45mpg tiddling round villages.

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