Another bad thing on high compression besides today's dismal fuel is that high compression makes more heat... On a street car that will be idling around in stop and go traffic high cylinder temps leads to high operating temps and overheated engines which can cause a lot of very expensive damage. Optimizing the compression may be best left to race cars and sticking with compression in the 9 to 9.5 range could be better. I like to spec my engine components for building torque which IMO is a much more beneficial for street use.....