Today's gas require a lower compression ratio.That statement is without question true. The thing that gets me is why would anyone build a engine that the SCR is too high and then use the DCR to bleed of the compression via cam timing or for that matter any other devise??. You would think a more straight forward approach would to build based off the SCR. Then try to keep as much combustion pressure as possible. It just seems like a patch work solution to the SCR using the DCR.