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Thread: BC MPG correction, facelift V6 CDTi

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    confused BC MPG correction, facelift V6 CDTi

    Is it possible to correct or recalibrate the BC?

    It consistently over estimates the fuel used, by about 4.5 litres per tank... or is this done deliberately to 'scare' you into refuelling the car early? The other week I had 1/8 tank and 3 miles left on the range (not driving hard), but get rather more than 24 miles to a tankful

    Would be nice to have the actual mpg shown...

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    Regular Member Penfold101's Avatar
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    My facelift 3.0 did that - I once went 20 miles when the range was showing 0 and still only put in 55 litres...

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by hebblemarine View Post
    The other week I had 1/8 tank and 3 miles left on the range (not driving hard), but get rather more than 24 miles to a tankful
    The BC uses the average MPG over the last 10 miles to calculate the range (let's call it the short average MPG)
    I suggest you reset the average MPG whilst driving along, after next filling up, so that it is more accurate rather than starting at zero

    Equally, set the BC to range with the key in the ignition (but not the engine running) and then try taking the fuel tank right down to the minimum mark (1/8) and then fill to the maximum
    During filling up it should display :
    RANGE
    ---
    Once the fuel tank needle has stopped moving it should then display the revised range (based on the previous short average MPG)
    As above, once you are back on the move reset the average MPG and then compare the range before and after

    My own car typically displays range = 30 miles when I reach the 1/8 tankful and the fuel tank warning light comes on
    Once the warning light starts flashing the range = 10 miles but the needle has just dipped below the 1/8 mark

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    Mine varies between 2 and 10%.
    The secret menu tells me I've got between 2 and 4 litres left, but always fill up with 51 litres (so actually 8-9 litres left). Range is usually about 30miles left. So approx 2 gallons for 30 miles. 15mpg, and it's a diesel.

    Top Gear did a test a few years ago, and all three car went to below 0miles range and still carried on!

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    I usually do that when I fill up - BC1, I leave alone - occasionally it resets itself, but it gives overall mpg over a few thousand miles. BC2, I always reset after filling up and the display does just what you say.

    When I fill up, I always properly brim the tank, to the point where adding more fuel would have it all over the floor (so you can work out mpg if you want and keep an eye on any unexplained changes in consumption).

    Range can go up and down: moving average, like you say... but the BC2 reported I had used 54 litres when I had just refilled with 50, putting the average mpg for that tankful down quite a bit.

    Was quite pleased with a calculated 39.5mpg (half motorway, half mixed mode, one DPF regen - half a gallon gone for that!) IIRC BC2 was showing 37 for that tankful.

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    Quote Originally Posted by DHobbs View Post
    Mine varies between 2 and 10%.
    The secret menu tells me I've got between 2 and 4 litres left, but always fill up with 51 litres (so actually 8-9 litres left). Range is usually about 30miles left. So approx 2 gallons for 30 miles. 15mpg, and it's a diesel.

    Top Gear did a test a few years ago, and all three car went to below 0miles range and still carried on!

    Secret menu? Explain please!

    Yeah, I've seen some of those TG ones. They managed to go a long way with "no" fuel.

    The VW Phaeton one, the car actually has a fake misfire that it runs to make you think it's really running out of fuel & it kicks this in sometime before you really do run out!

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by hebblemarine View Post
    I've seen some of those TG ones. They managed to go a long way with "no" fuel
    Not recommended
    Basically the fuel tank gauge covers about 95% of the actual fuel, if you fill the car to the limit and then drive it until it runs out
    Hence if you regularly drive the car with less than half the tank full the BC can become slightly innaccurate (as it has to exclude the fuel below the lower threshold of the fuel tank gauge)

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    Usually I run it to an indicated 1/8 tank, then it takes around 50-52 litres to brim it so there's still a decent bit of fuel in the tank...

    Never run it below zero range, though! There's that psychological barrier thing going on

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    Quote Originally Posted by hebblemarine View Post
    Secret menu? Explain please!

    Yeah, I've seen some of those TG ones. They managed to go a long way with "no" fuel.

    The VW Phaeton one, the car actually has a fake misfire that it runs to make you think it's really running out of fuel & it kicks this in sometime before you really do run out!
    its not a "fake misfire" the car drops a cylinder to be more frugal.. as its anticipating that you may run out of fuel as you havent filled it when the warning has been displayed == there are several manufacturers who do this now including Ford

    Merc on their new "supercars" will have a button for town driving drpping half of its cylindersto improve consumption



    mines the same .... but i would rather it over estimated... than under delivered

    0-Large smile ......every time it's driven

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    My bad for believing what Clarkson says, D'OH

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