(26 Mar 2014, 8:43 am)Scott wrote 5.5 MPG for the Citaro, and about 6.5 mpg for the Solar Fusion, so the Solar is probably more cost effective.
I would convert both routes to double deck.
Reasoning? I would personally assume standard single decked vehicles would be appropriate. Not to mention that the X66 must use single decked vehicles due to a low bridge, as has previously been discussed on this forum.