Grab a Vagtool...
1. Get into the Instruments module (module 17).
2. Click the Recode button. (07)
3. Write down the code number in the box so that you will remember it.
4. Don't mess with the Workshop Code box though.
5. Change the third digit in the code number to 5.
6. Our original should be 1.
7. You will get km/l display immediately
Tested on Skoda Octavia Elegance
Try at your own risk
The following below describes the various numbers
section 17 (instruments)
The third number is country version, where..
1= EU (24h clock, km & l/km)
2= USA (12h clock, miles & miles/ US gallon)
3= Canada (not sure on difference)
4=UK (24h, miles/uk gallon)
5= Japan
6= Saudi Arabia
7= Australia