Johnkpap,

I do use my engines with fuel pressure regulators near the carburetor and tank for the next reasons:

I want:

Optimum power in any position and any moment.
Optimum constant fuel/air ratio on any power level so less fuel consumption
Fuel/air ratio independent from G-forces during maneuvers.
Idle nose up and nose down
Max power nose up and nose down

But first : Fuel consumption? of these both engines, because what to do when you cannot finish your pattern flight because of a dead stick.
Also less fuel consumption, less changes in CG position.
(Most important cheap-Dutch!)

Cees