Originally Posted by Paul
A misconception, it is not the SAME motor. It is a similar motor.
Of course it's not 100%, but it's funtionally the same. Honda loves to change the smallest of things and claim a "new" engine.
Not entirely true either the Si in the 5th generation Civic was a 1.6L, the Si in the 6th generation was a 1.6L, and the 7th generation was a 2.0L. For the most part the lower trimmed Civics followed this trend, however the statement doesn't hold true to all Civics.
The Si has always been the exception. Si sales are also extremely low compaired to the other models, so that doesn't matter.
The .1L per update is an obvious generalization, I don't see the need to list every per-model engine as most generations had at least two availible displacements.