[Flieger]

"MFI injects fuel into only the cylinders that want it" meaning, the cylinders on the intake stroke. Meaning pulsed injection, not continuous.

If the earlier statements were unclear then sorry but I was trying to explain the same thing each time.

CIS is a mechanical carburetor- injection far upstream. There is opportunity for the fuel to condense on the intake runner sides and to pool behind the closed intake valve, hampering efficiency. Thus the need for the swirl inducing pistons. MFI injects at fuel pressures higher than anything but a diesel or a direct injection system, and injects it right upstream of the open valve. Therefore, more precise fuel control and better mixing (finer atomization, which improves combustion efficiency).

Not to mention the restriction of the CIS barn door.