Lowering the compression ratio is not for those who want better fuel economy. It is for those who want to introduce more boost and fuel into the engine for more power. The cylinder pressure rises dramatically with a little more pressure and heat from turning up the turbo and this is amplified by the compression ratio. Cummins can make big numbers without detonation due to their lower compression ratio. Mercedes will grenade if pushed to hard by the turbo and extra fuel. It is much like slapping a turbo on a honda and an older mustang.