Uf, not to forget: a normal average is about 13 litres per 100 km, whuch is OK, the bad part is that it ios practically impossible to get it (did whole tahnk featherfooted, really saving) to go below 11 ...
You can get 9 from Golf GTI, and from first kilometres I suspect taht Astra OPC will go below 10 easily if drive carefully. We'll see, just got it ...