Pretty sure producing R18s are cheaper then K20s.
That picture is an L-series engine out of the hybrid, not the R20 fwiw.So word is from Acura that the motor is the same motor found in the current 9th Gen civic which is an R18 which also was in the 8th Gen Civic as well.
Here is a picture of the motor in the engine bay,
They bored out the motor .2L more to obtain 2 HP more and some more torque, but why use this motor? I know the recent R18 in the 9Th gen can achieve 40MPG, but why not use the De-tuned K20 for the base model, which were found in the previous Gen CSX, the predecessor of the ILX.
In a sense They are downgrading?