The CU2 Auto and Manual have some differences in level of tune. The Auto produces slightly less torque and the peak is 100rpm lower than the Manual. (234Nm@4,300 rpm v's 230Nm@4,200 rpm).
http://euro.honda.com.au/about-the-c...spx#powertrain
The CU2 engine has improvement over the CL9; such as the increased compression ratio from 10.5:1 in the CL9 to 11:1 in the CU2. This is a substantial improvement in efficiency.
The problem might be related to the relatively high compression ratio but if Honda states in its specification that the CU2 need only use 95 RON then people should not have to buy 98 RON.




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