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Another factor as the voltage drops is that the ECU adjusts the fuel injector timing to compensate. This may affect efficiency and also the calibration for Scangauge or similar systems. I tried to find out once if Scangauge did calculate fuel correctly based on injector timing. I think it may do so but I'm not 100% sure.
Since you are dealing with rather small differences here, you may have to perform a dedicated experiment to quantify these effects. If your instrumentation calculates correctly when the ECU/injectors run on low voltage, it gets easier. Then you only need to find out if the engine works better or worse with normal/low voltage. If there is a degradation, you may be able to find a workaround, eg. extra batteries to keep voltage up.
At least some of your test runs indicate that your engine may degrade with lower voltage.
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