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Thread: Fuel economy suffering

  1. #1
    Regular Member Gubmint Agent's Avatar
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    Vehicle : Vectra

    Trim : Sri

    Engine : 2.2 Direct

    Year : 2007

    Default Fuel economy suffering

    Firstly, the car's a 2.2 Direct with 56k on it and secondly apologies for lack of formatting in this post but I am at work and the IT is sh*te. Just wondered if anyone can suggest reasons for my suddenly-dropping MPG figures. Previously I have held combined urban/distance MPG at somewhere around 36.5 - 37.3 but this has recently fallen to 34.3 MPG. I re-set the BC1 counter each time when I fill up and the last three tanks of juice have only given me around 33.4 MPG. I did wonder if this was in any way down to using Morrisons unleaded for the first two of these three tanks since my fuel light came on at the 390 mile mark where as previously I'd have made it to the 430 mark before needing to refill. My most recent tankful of reputable petrol got me to 402 miles before the fuel light came on. I have in the past managed to reach 480 miles before needing to fill up (but that was a one-off!) There have been no indications that the thermostat is playing up or doing anything differently and I am not doing any different driving (eg, no more short journeys than normal). Anyone got any ideas?

  2. #2
    Regular Member MrDerv's Avatar
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    Default

    Tyre pressures or recent additional load (owt in the boot?).

    Other than that, it'll be engine related. Hopefully someone knowledgeable in the 2.2 will be able to help

  3. #3
    Regular Member stevoxsi's Avatar
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    Vehicle : Insignia

    Trim : Sri Vx-line

    Engine : 2.0 Cdti 160

    Year : 2011

    Default

    Colder weather?

  4. #4
    Regular Member rushy's Avatar
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    Old School Vectra-C.Com. Residing in sunny Leeds.
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

    Default

    Intake temps can lower the MPG by 1-2 I find.

  5. #5
    Regular Member m8internet's Avatar
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    Shorter, slower journeys
    Lower temperatures

    Every petrol car I have had usually shows a drop in the average MPG during December and January
    Usually by March it has returned to normal

  6. #6
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

    Default

    Check your swirl flaps are working mate. Any loss of power?

  7. #7
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    Vehicle : vectra c

    Trim : ls

    Engine : 1800 non vvt

    Year : 2004

    Mileage : 136000

    Default

    i would of said lower temperatures plus using your heater more

  8. #8
    Regular Member Gubmint Agent's Avatar
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    Vehicle : Vectra

    Trim : Sri

    Engine : 2.2 Direct

    Year : 2007

    Default

    Thanks to everyone who replied; my tyre pressures were a little down on normal but I don't think this was the root cause. MPG seems to be picking up a bit now, so hopefully after the car's had a service it'll be even better.

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