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Thread: M P G Query

  1. #1
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    Default M P G Query

    2.2 PETROL Vectra Elite, normally used round the doors by the Mrs and economy pretty bad 22 - 24 however done a lot of motorway miles this weekend sitting about 3500 revs down the M6 and on cruise control so not doing anything stupid with the loud pedal and still only got 26.2 am i being greedy or is this bad? it seems to be getting gutless at the bottom end aswell could they be linked? any suggestions please. cheers, John.

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    Regular Member m8internet's Avatar
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    Reset the instant and average fuel meters in the Driver Info Display
    Perform a full tank to full tank mileage test, then compare

  3. #3
    Regular Member Gsi3.2's Avatar
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    26 MPG is about right if it's an auto....

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    I reset the trip computer at the top of the M6 to check it and drove conservatively to see wot it was, on a full to the neck tank it done 294 miles before the light came on, i didnt think to fill it up again afterwards.
    Its not an auto GSI3.2 just seems to like a drink as for the flatspots and gutless low end i have tried the airbox mod and iridium plugs as suggested in another thread, does anyone think the EGR valve might be blocked or broken as i have seen this mentioned a bit aswell, or is it just needing traded in as its been around the block a bit 96000 miles, thanks, John.

  5. #5
    Regular Member Flaninacupboard's Avatar
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    Mine is 2.2 direct with six speed box and does a reliable 36 to the gallon.

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    Regular Member SirGSi's Avatar
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    Johny - I'd get it checked out m8.

    I can get around 35/36mpg on a long motorway run (300+miles) - this is sitting at around 70-75mph and with a fully laden car (4 people + full boot!).

    The V6 'idles' at around 2600rpm at 70mph though.

    Around town I get 22-25mpg.

    ATB
    Grant.

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    Regular Member MysteryElite's Avatar
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    What age is the car and which gearbox? I'm guessing a 5 speed at 3500 revs as that sounds a bit high. I had a 2.2 SRi 'B' before and that was thirsty - around 31-32 average with mainly motorway, so with a heavier car may not be far off with that gearing. The 'B' SRi was geared for performance rather than economy and could certainly have used a 6th for motorway cruising.

    As SirGSI said, the 3.2 in 5th (Auto) sits around 2500 revs for 70 (bit less I find on the Elite). I currently get an average of just over 30 in mine, again mostly motorway, and that's in a 3.2! Consistent town driving hurts that a lot especially with the auto box.

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    Mysteryelite its a 52 reg'd 5 speed, my vectra b was always around 30- 32 aswell and i used to taxi that (quickly around the doors). Maybe i just got a bad one this time
    Ihad a tinker on last night and found a bit of oil building up in the throttle body and on a sensor in there,i gave it a good dose of carb cleaner and it seems to give it a bit more pull from low revs hopefully this might help the mpg's, thanks for all the input, John.

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