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Sounds like an initiation queston. The answer is yes. It would hard to believe no wouldn't it.
I do want you to know that my understanding of engines is all book learned. So I won't even pass as a "self professed expert".
So you might expect the explanation to your question to sound like it came out of a book. One way to improve thermal efficiency is to use the "Miller Cycle". This is essentially a regular engine with an adjusted valve timing. The key is the intake valve closing time. You can close the intake valve early or late so to reduce the intake charge which in effect reduces the compression ratio. But the expansion ration hasn't been changed so that the burnt charge can expand to a lower pressure before it is exhausted.
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