fuel tank capacity for S4R(T)

[ChchS4]

The owner's manual for the S4R Testastretta says that the fuel tank capacity is 15L but the Ducati spec site http://www.ducati.com/bikes/monster/s4r_testastretta/2007/tech_spec.do) says that the capacity is 14L.  Any thoughts on which is correct?  Grateful for any advice because 1 litre actually makes a difference and I would prefer to not find out by running dry!