[UFO]

Factory fuel pressure across the injectors is typically around 40psi. The pumps will dead head over 80psi. I went to a Porsche pump that will put out over 100 psi so I have the overhead to maintain fuel pressure over 20 psi of manifold pressure. I am still running about 45 psi at the injector over all manifold conditions.

I'm sorry for the tangent, but I think it points to the simplicity of the OPs goal of comparing the efficiency of one gear over the other. Fuel injectors take a relatively long time to open and typically cannot reliably deliver fuel under 5% duty, so your efficiency comparison may break down at lower duty cycles.