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Thread: 1.8 VVT Average MPG - Suprise!

  1. #1
    Regular Member SteveBray's Avatar
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    Smile 1.8 VVT Average MPG - Suprise!

    I only go mid sixties on the motorway and mid fifties on country roads, having said that I am still usually the quickest driver anywhere but the motorway. I always try to plan ahead and maintain momentum. On my recent trip from Yorkshire to Cambridge via a few towns and cities, some heavy traffic in a couple of cities over 400 miles my average miles per gallon were:

    49.3

    This is calculated after filling up, not the computer. My previous best on a similar trip was five miles to the gallon less. The difference this time was a service, new filters, oil and spark plugs. I am suprised and very pleased with the mpg, I had the air conditioning on quite a bit too, the radio and sat nav plugged in, three people in total with luggage too. My car has done 33,000 miles and is just over 3 years old.

    Anyone else done as well on a long trip?

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    Good for a petrol. I get mid 50s with my CDTi and mid 40s when towing the caravan on long trips.

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    VIP-Member Das's Avatar
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    Vehicle : Lada

    Trim : Riva

    Engine : 6.0 V12

    Year : 1954

    Mileage : 567890987

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    Damn good for a petrol. There are many on here with Diesel who don't get anywhere near that. How far out was the computer, compared to calculating it manually? Best ive had was a combined 41mpg from my 1.8 16v.

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    Quote Originally Posted by DasArab View Post
    Damn good for a petrol. There are many on here with Diesel who don't get anywhere near that. How far out was the computer, compared to calculating it manually? Best ive had was a combined 41mpg from my 1.8 16v.

    I only get about 44-46 mpg on day to day commute in my CDTi. The figure I mentioned are for the weekend trips across N.Ireland to visit family in Darkest Fermanagh.

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    Regular Member SteveBray's Avatar
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    The computer is very acurate but shows my average for about four thousand miles so for this trip is no use. The overall average is showing about 44 MPG but that does include some heavy town and city use but still quite good for petrol Vectra I think. The best I ever got from my diesel Signum (with Spider box which helped) was 53 mpg and that was being very careful. The Signum was noticably worse on mpg than the equivalent Vectra I had before which did 56 mpg on a long trip around Scotland and I was not being careful at all. I think the extra weight, shape and maybe DPF robbed the Signum of performance and economy in comparrison to the 2004 150 diesel Vectra I had.

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    What is heavier in the Signum? Wheels are further apart, but over all it is no bigger, may be even smaller???

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    Wind speed & direction makes a big difference but not as much as your driving style. Good work! Did you do any drafting?

    Try disconnecting the alternator next time - should see 10 - 15% improvement.

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    I never draft, I think it is very dangerous and some of the ways hypermilers get good mileage is highly silly, turning off the engine downhill, drafting a lorry a few feet away for miles on end, starting up in gear and other such crazy antics.

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    I draft coaches mainly, they go a bit quicker than lorries.

    Drafting at any resonable distance makes a measurable difference, saw an episode of mythbusters, they showed that even being 100ft behind a lorry improves consumption by 11%, so no need to be too close.

    Here's their results @ 55mph (i think)..

    10ft = 39%
    20ft = 27%
    50ft = 20%
    100ft = 11%

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    Regular Member Derek Mc's Avatar
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    I find if you draft or follow a large 4x4 that is doing 70+mph and have the instantaneous con's on it is amazing how it jumps at three car lengths or more, do NOT make a habit from that sort of thing however I usually just set cruise at 77mph and let her do the work

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