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Thread: Thought my petrol guage had broke

  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 Thought my petrol guage had broke

    Evening All, was driving back from Edinburgh this afternoon and was half way down the A74M after coming on at junc13 and it had hardly moved. I thought oh god has it broke. I just stuck to 70mph on the way home and only had my golf clubs and overnight bag in the car and used alot less than normal as by the time I got to Anfield to my mates and I hadn't used half a tank it was just passed the 3/4 full mark. Normally uses half a tank or just abit more from Prescot to Edinburgh doing 80-90ish. I'm made up shows you how much more air con and that uses. I've noticed I get more miles for my money using shell and esso over tesco and asda etc has anybody else noticed this? Loving the vec at the min wish I would have got a 2.0T but this is so so cheap to run.

  2. #2
    Regular Member m8internet's Avatar
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    If you are driving at a constant higher speed, then the average tends to be higher as you are not using a lower speed which consumes vastly more fuel
    As an example I can use 7 litres just driving around Glasgow City (about 30 miles)
    However the same 7 litres on the Motorway can get me 50 miles
    When you convert that to a full tank you can see it makes a big difference
    If I fill the fuel tank in Cumbernauld, I can get all the way to Moffat on the M74 before the needle moves

  3. #3
    Regular Member rich r's Avatar
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    Slow down to 65mph and you'll find it uses a lot less fuel than at 70mph, and only adds a couple of minutes to your journey. Slow to 56mph and it's even better . I'm currently getting around 52mpg average in my 1.8 petrol/LPG Elegance (around 43mpg when running on LPG), that's on mainly A-roads, single and dual carriageway, 55 miles a day.

    But yes - keep your revs fairly constant and as low as you can get away with (I usually change up at 2000rpm), keep a nice distance from the car in front so you don't need to use the brakes to slow when the traffic does (because braking just wastes energy as heat, and you always slow too much so have to accelerate again), only overtake if you really have to etc. - and you can get quite a reasonable economy from the Vectra.

  4. #4
    Regular Member alcutler's Avatar
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    Vehicle : vectra c 1.9cdti 120 estate

    Trim : design



    Default

    I have been driving around with VX roofbars fitted to my 1.9cdti (120) estate and been getting on average 43 mpg - I read somewhere that roofbars can cause an increase in the amount of fuel you use and took them off - now a little over a month later doing similar journeys town/motorway I am averaging 53mpg - at 70mph the car is a lot quieter so I can recommend removing your roof bars if you have them fitted.

  5. #5
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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

    Default

    Quote Originally Posted by m8internet View Post
    If you are driving at a constant higher speed, then the average tends to be higher as you are not using a lower speed which consumes vastly more fuel
    That's not the reason. The reason changing speed is poor for fuel consumption is the fact that:

    a) You are having to accelerate through the gears to return to the speed limit.

    b) Braking wastes the kinetic energy of the engine when it is converted to heat at the discs.

    Low speeds and light footed driving returns fine fuel economy. It's the daft notion that skipping gears is beneficial for fuel economy when it's not that's the problem. All that happens fuel may not be burning properly in the engine which is a waste too and is even worse when the if the engine starts labouring.

  6. #6
    Full Member neverlandandy's Avatar
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    Vehicle : Insignia Elite Nav

    Trim : Elite

    Engine : 2.0 cdti

    Year : 2012

    Mileage : 9k

    Default

    well heres one for you my insignia was getting a better mpg at 88mph than it was at 69mph
    i was watching the instant consumption thingy
    and on my private road i tried this a few times with the same result

  7. #7
    Regular Member BigWilko's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 3.0 CDTI

    Year : 2005

    Default

    I was told when i bought my (dirty) Renault 8 years ago that when the car is tested for it's MPG rating it's done at 50mph as this is the most economical speed. When i had it it did about 39mpg at 70mph. A 50mph it was doing about 49mpg. I tried this when i had my 8v vec. i was getting about 65mpg, more if you sat behind a truck on the mororway. Always worth remembering if the orange light is on

  8. #8
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    Default

    im amazed at how economical my 1.9cdti i filled up in darlington and drove down to falmouth and when i arrived the needle hadnt reached the half tank marker that was two up in the car with luggage and averaging about 70mph....incredible for a car of its size

  9. #9
    Regular Member 19CDTi's Avatar
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    Waddington and back last year - using the *fill up, drive, fill up, calculate* method gave me 52mpg in my 1.9 8v without driving inordinately carefully... just kinda "normal" without caning it! I was impressed

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