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Thread: Strange Diesel / Petrol difference in economy of auto

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    Default Strange Diesel / Petrol difference in economy of auto

    Just been looking at figures to convince myself the move from a manual CDTi to a 2.2 direct auto isnt a disaster and noticed that the impact of the auto box on fuel economy is much greater for a diesel than a petrol. figures in the VX product guide show a reduction in extra-urban economy of 7.5mpg for the diesel and 0.8 for the petrol. Is this right and if so why?

    R.

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    Hi Rheumatoid,
    Don't want to disappoint you but I've just done the same and it is indeed a disaster. I've just gone from a 1.9CTDI Zafira @38mpg round town to a 2.2 auto Veccy and i'm lucky to scrape 22 out of it, and that's driving it so carefully it's boring. It's gonna have to go, it's gonna cost me about £1000 a year more than my Omega!!!

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    Moderator & Events Assistant paulhb's Avatar
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    I have the 1.9 cDTI auto and I have averaged 44.5 MPG over 4000 miles normally get 50 on motorways and 36 mpg around town the later models are better but for there is a difference of £75 in road tax because the emissions are higher.

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    got a 1.9auto and i average 40-44mpg per tank and thats not hanging around if I drive very carefully have had 55mpg

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    I don't do a lot of round town stuff and my annual mileage isn't high. Just done norwich to cambridge return with some town work and averaged 38mpg. I think on balance the swap for me was ok. 1 yr newer, lower mileage (20k), far better condition and much higher spec (Design Vs Exclusiv) and auto (which I like) for the same money. I just thought it was interesting that the auto box seems to have so much more impact on the diesel economy.

    1.9CDTi 16v (150PS) estate manual = 58.9mpg
    1.9CDTi 16v (150PS) estate auto = 51.4mpg

    2.2i 16v Direct estate manual = 45.6mpg
    2.2i 16v Direct estate auto = 44.8mpg

    Extra urban VX figures

    Will probably wet myself watching the fuel consumption with the caravan on the back though - only one season left though as the kids are getting to old to want caravan holidays.



    R.

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    Regular Member no1golfer's Avatar
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    don't know where they get there figures from,no way you can get 44mpg out of a 2.2 direct auto.i get 34-35 average and very happy with that.got alot less out of a 1.6 c4 auto,around 28-29.

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    Full Member Big Sig's Avatar
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    If you are this conserned then stick to a diesel as they will always be better on fuel.
    Now I need a turbo to keep up!

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    I'm not that concerned because of the mileage I do and the A road nature of my driving. the additional outlay for a diesel car (over 2k for equivalent of mine) and the price differential between diesel and petrol means you need to do quite a few miles a year to see any benefit. 38mpg today was fine by me and i reckon if I had set it at cruise at 56 I could have got over 40 but that would have been painful. I kept at the limit for the roads.

    anyway, thats getting away from the observation that auto impacts more on diesel mpg - making the advantage of a diesel over a petrol auto less significant than for manuals.

    R.

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