" As a driving gas we use C2O (carbonic acid) over here in Germany. It is tasteles and doesn't affect the taste of beer."

I thought Germans were supposed to know about beer, the Reinheitsunterseeschwimmengeboot and all that. The use of CO2 as a blanket and propellant for keg beer was the original raison d'etre of CAMRA. That and the retention of wooden barrels, which campaign was lost.