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Thread: How accurate is the range and fuel guage?

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    Regular Member Sigmacca's Avatar
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    Default How accurate is the range and fuel guage?

    My Signum tells me that I only have 11 miles left to travel yet my fuel guage displays 1/8th of a tank, which I make 7.5 ltrs or just over one and a half gallons and at on average of 37 MPG, I should have enough to do 55.5 miles.
    I do not normally let it run this low and will be filling up at my next trip as have no intention of running out.

    So which display should I believe?

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    I'd go off the lowest one, ie, your range display!!

    Mine seems to work together. I once ran mine down to zero on the range, and the guage showed empty at the same time. I drove half a mile to the nearest garage and filled up with diesel and got 59.5 litres in (60 litre tank). Wouldn't do it again though!

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    Regular Member Sigmacca's Avatar
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    That was a close call, I'm starting to worry now in case of any muck in the bottom of the tank getting dragged up..

    I was just wondering if a certain amount of reserve had been calculated into the figure so 11 miles will really give me 31??

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    Could always stick a jerry can full of petrol in the boot and run it down, see what happens

    Personally, I'd fill it to the brim now, make a note of how much yeu get in, take into account the size of the tank, and that will tell you approx how much was in before you filled up. Then reset the BC readings too

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    Regular Member Handyandy-UK's Avatar
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    Deciding which is the more accurate is a difficult call really as they are two different devices giving different information:

    Fuel Gauge - This will always be displaying the physical contents of the tank and is only really dependant upon how well it was calibrated at the factory.

    Bord Computer/Trip Computer - This is calculating an estimated range based upon fuel remaining, driving style, fuel flow rate, etc and is updated every few miles.

    So as an example you might be driving along 'enjoying the full power of the engine' with the tank gauge showing 1/4 remaining and the BC Range showing 30miles, but if you then drop to 56mph on the cruise control you'll almost certainly manage far more than 30miles before the gauge hits 0.
    So at both times, both systems might be considered reasonably accurate in the information they were displaying.

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    Full Member chrisvectra's Avatar
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    Mines even worse then that the bc comes on at 30 miles to go yet the fuel gauge shows a1/4 of a tank don't trust either to be honest lol
    VXR IS FOR LIFE NOT JUST FOR THRILLS !



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    in my 54 plate vec with a tuning box, i had 11 miles showing on the BC then it stopped!
    fresh out of derv
    cdti's dont appear to enjoy being run dry! it was a biatch to get it started again!

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    when my fuel guage is just on the red mark like yours in the photo I can only get 53.2 ltrs in the tank,, its a 61 ltr tank,,, I work it that each of the 8 segments of the guage is 7.6 ltrs aprox, but,, thats my car, I am sure they will all be a bit different.

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    My old 05 1.9 cdti was way out, and I always went off the gauge not the computer as conked out with 16 miles still showing.
    On the other hand my 06 3.0 cdti is spot on gauge and computer both seem to work together, on red the other day almost ran out and gauge went down to 2 miles

    Nick

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    Quote Originally Posted by tony-1977 View Post

    Personally, I'd fill it to the brim now, make a note of how much yeu get in, take into account the size of the tank, and that will tell you approx how much was in before you filled up. Then reset the BC readings too

    yep thats the way to do it.

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