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2015 mercedes benz c400 comsumption figure problem

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Old 01-22-2017, 03:48 PM
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2015 mercedes benz c400 comsumption figure problem

As u can see in the pictures. I didn't even put my foot on the gas panel. It is still saying I'm consuming 20l per 100km. Can some tells me what happen? Should I go to mercedes dealership to fix. Is this kind of problem under the 4 year factory warranty? Thanks
Old 01-22-2017, 05:24 PM
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at rest your mpg will be 99.9l/100km (or in fact infinite) as you are not moving..


have a look at your trip l/100km after having driven with a reset at the start of the journey......


if its still this high look for fuel pouring out the underside of your car ... (it won't be this... )...

Last edited by Shadwell; 01-22-2017 at 06:28 PM.
Old 01-22-2017, 05:26 PM
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If you're not moving, the computer can only calculate based on fuel being used with no forward motion. That's not going to be very high number.

My car does not show a high number at idle, so not sure why Shadwell's shows 99.99.
Old 01-22-2017, 06:20 PM
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Originally Posted by Shadwell
at rest your mpg will be 99.9mpg (or in fact infinite) as you are not moving..


have a look at your trip mpg after having driven with a reset at the start of the journey......


if its still this high look for fuel pouring out the underside of your car ... (it won't be this... )...
Should be zero mpg since you aren't moving. Inifinite if you were moving and burning no gas with the engine running which is obviously impossible.
Old 01-22-2017, 06:27 PM
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Originally Posted by Mikey53
Should be zero mpg since you aren't moving. Inifinite if you were moving and burning no gas with the engine running which is obviously impossible.

Yeah soz, I am forced to run on L/100km down under... which is the inverse.. you sit still your number climbs.. you sit long enough you hit 99.9.. or off the scale..


I saw the picture and it was in L/100km, hence my comment which is correct for that measure.. my use of mpg was a **** up..
Old 01-22-2017, 06:31 PM
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Originally Posted by StanNH
If you're not moving, the computer can only calculate based on fuel being used with no forward motion. That's not going to be very high number.

My car does not show a high number at idle, so not sure why Shadwell's shows 99.99.

its calculating the fuel used per KM.. if you use fuel with zero movement the number can climb quickly.. instantaneous vs over trip distance here as average over trip will climb very slowly the longer the trip..

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