For a given manufacturer the actual target is 130 + 0.0457 * ( M [kg] - 1289) gr CO2/km, where M is said weighted average in kg. So for Daimler at an average weight of 1480 kg that comes out at 139 gr CO2/km in 2015. Fiat at 1110 kg average gets a target of 122 gr CO2/km in 2015.
The 130 gr target is a weighted average for all the manufacturers combined, but no single manufacturer can be held responsible for meeting that target.
A Mercedes A-Class comes in at 128 gr CO2/km which (almost) compensates for the 154 gr CO/km for an entry level E-class. In The Netherlands fuel efficient cars have taken a huge leap in popularity - partly due to tax regimes - so I expect e.g. Daimler to be much closer to their 139 gr/km target than they were in 2006 (at 180 gr/km).