Now a days guys are running more compression than the past,mainly because people are using electronics to control timing,& having knock sensors ,better fuel distribution & so-on.
Running a low compression engine will (for ther most part) get worse mileage, slower spooling of the turbo,& just an all around sluggish engine.
My Syclone has 8.4:1 & is a bit sluggish when out of boost.
MBHD
