The Federal Returning Officer announced that until 14.00, 41.9 % of all eligible voters have cast their ballots. This is slightly less than in 2002, when 42.8 % did so until 14.00. In 2002, total voter turnout was 79.1 %.
Therefore, an area that is traditionally voting for CSU has a lower turn out and an area that is tradtionally voting SPD has a higher turnout.
that still might lead to a lower overall figure.
of course, all this is fantasy land...