Instrument cluster coding

Hi all.

I've got myself an Octavia yesterday. Quite happy with it as it's low mileage.

As I also own a Passat, I already own a Ross-tech cable.

I've tried to change the cars instrument cluster from imperial (UK spec) to metric (for Ireland). I change the country code, but only the mileage reading changed to metric. The fuel estimation / consumption is still in imperial??? (the small display on the left, under the rev. indicator)

Any chance this can be changed also? I've looked on all Ross-tecj viki's and forums. Nothing.

My hope is in you guys. Any help appreciated!