27-30 on average yes.
However as other posters have said when its cold the avg drops significantly for the first 2 miles or so
You say instantaneous readout on comp1 , but thats averaged too , so looks really bad at the start of a journey from cold but improves as you go further/warmer
The next option along (another press) is instantaneous rapidly changing
This should show high values when off the throttle , up to 170 mpg ish where it then goes '----' on liftoff of throttle.
Very short journeys will hurt the mpg badly , but I still think from what you said with a std GTI you should be getting more.
Check your tyre pressures too
