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Thread: fuel economy and trip computer

  1. #1
    Regular Member solorider's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9 120bhp

    Year : 2004

    Mileage : 139,600

    Default fuel economy and trip computer

    i know this is a regular topic regarding the fuel economy on my car,and some others on here with the 1.9cdti,i haveagain filled up which i do seem to be doing a lot on this car,i have never known a diesel with a small engine be so expensive to run,to give you an idea of the fuel economy i have done 100.1 miles 90% urban driving doing stop starting and 30-40mph roads with not too much start starting,i have not driven the car hard except for one time and that was just to get in front of a car.

    computer says 33.3mpg,actual 30.7 mpg
    computer says 3.0 gallons used,actual 3.26 gallons

    so at the moment i cannot think of any reason why this car is crap on fuel economy,there are no warning lights,no excessive smoking except when cold there is some smoke,no leaks at all,tyre pressures at the correct level

  2. #2
    Regular Member Penfold101's Avatar
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    Quote Originally Posted by solorider View Post
    I have done 100.1 miles 90% urban driving doing stop starting and 30-40mph roads with not too much start starting
    Quote Originally Posted by solorider View Post
    So at the moment I cannot think of any reason why this car is crap on fuel economy
    Answered your own question there dude...

  3. #3
    Regular Member solorider's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9 120bhp

    Year : 2004

    Mileage : 139,600

    Default

    i would have expected somewhere nearer 38mpg not 30mpg

  4. #4
    Regular Member Penfold101's Avatar
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    Well, such is life... The engine's designed for the motorway...

  5. #5
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    I think you need to prove your car is economical before assuming it isn't. I would fill the car and drive it on motorway for a long run, say 150 miles or so, have a day out. Drive it at motorway speeds and fill up when you have covered a good distance the check the mpg. I drove to Exmouth from Preston, lancs in my 120 cdti fully loaded at motorway speeds with cruise on. Did 270 ish miles, very little stoppages, and averaged a nats over 50 mpg. when knocking about town it drops dramatically to around 40 mpg in what I would call 'extra urban' motoring. If you can prove you can get around 50 mpg on a motorway run then there's not much wrong with your car, your mpg is purely suffering due to the type of runs you do.

  6. #6
    Regular Member solorider's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9 120bhp

    Year : 2004

    Mileage : 139,600

    Default

    well im driving to taunton tomorrow and will be sticking to 60mph,i will soon confirm the mpg on a run

  7. #7
    Regular Member m8internet's Avatar
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    Quote Originally Posted by solorider View Post
    computer says 33.3mpg,actual 30.7 mpg
    computer says 3.0 gallons used,actual 3.26 gallons
    How did you calculate the fuel used?
    The computer takes the direct measurement through the fuel pump

    If you are using direct consumption, then you need to wait until you have used up about five complete tanks of fuel, also you really need to operate fill to fill to be more accruate

  8. #8
    Regular Member Avenged's Avatar
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    i have a 1.9cdti 150, auto.. an yerh aroun town i get roughly 35-40ish... tha's normally on a 30-40mph road's.

    On the motorway... staying at 70 with cruise.. i'll get about 58-63mpg.
    saying that tho.. today, i got 78mpg! haha!
    must of been down hill on the motorway!

  9. #9
    Regular Member Teefin's Avatar
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    I have the 1.9 120 and had initial problems witht he computer set to US gallons.

    I have sorted this and have found that with runs to and from work 13 miles each way I get about 46-49MPG fill to fill not readings from Computer which can be asmuch as 4-5 mpg out. Motorway runs nearer 50-53 keeping to the speeds.

    The lowest reading were on the fronty morning when the car was stationary running while clearing windows.

    As prevuiously stated 3.0cdti big lump for local runs.

  10. #10
    Regular Member solorider's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9 120bhp

    Year : 2004

    Mileage : 139,600

    Default

    Quote Originally Posted by m8internet View Post
    How did you calculate the fuel used?
    The computer takes the direct measurement through the fuel pump

    If you are using direct consumption, then you need to wait until you have used up about five complete tanks of fuel, also you really need to operate fill to fill to be more accruate
    i have been filling the tank,always 30mpg actual

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