GTS gas mileage indicator

[alfacorse]

Is your mileage indicator telling the truth?
In my 2013 GTS Sport the mileage indication from the BC is optimistic of at least 7/8%, meaning that when indicates a medium consumption of 12lt.x100 km, making the calculation myself after refueling results in a 13lt. real consumption.
Are you guys experiencing the same? This kind of error seems pretty much to me...

 

[EXCF350]

When I first got my GTS I calculated the consumption for the first couple of fill ups and found the MPG figure pretty accurate so have not bothered to calculate it since. Maybe there's a difference between the cars metric and imperial calculations.

 

[mcs]

I've never bothered calculating as the sound is too good for me to think of anything else

 

[alfacorse]

ok it's not an important issue, but as I'm quite precise on these topics I'd like to understand if it's mine which gives a wrong indication or if it's common