The 2nd (on the mfd) fuel consumption runs about 50-55mpg but actual useage is 45

No sign of a leak and no smell of desiel around the engine/injectors

I've had it for a year and it is always been the same.

I did a change of oil and all filter's last year. 88K miles

 

On my old Fabia tdi it was a close match so not sure why this is so different 

MFD is usually off by around 15%. If you have some patience and VCDS, you can correct the calibration.

Strange wonder why is so bad compared to the Fabia.

Is there a guide to using VCDS for this?

On 16/06/2023 at 00:09, chimaera said:

MFD is usually off by around 15%. If you have some patience and VCDS, you can correct the calibration.

 

Rarely that far out unless it was the MK2 Octavia I sold where I had made it very optimistic like myself!

 

I dont even think that  VCDS will allow a 15% recalibration.

IIRC it allows +/- 15%.

 

@OP, you will need to do a few brim to brim economy checks and for each one reset MFD2 to zero. When you fill up each time record the MFD average economy and compare it to the actual economy from brimming the tank. If you do this over a number of tanks you'll get a pretty accurate correction which you can use in adaptation channel 3 on the instrument cluster: http://wiki.ross-tech.com/wiki/index.php/VW_Golf_(1K)_Instrument_Cluster#Adaptation