ehhe people tune there cars to 16:1 on low load
as for on load it really depend son how the motor takes it really 12.5 - 13.5 is a good range to be in depending on the airflow and the load (temp is a factor in all tuning)
I was always told this engine would not be a good one for the MKI as its too heavy (the MKI) i never believed it!