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if you're dropping fuel pressure at normal voltages, you already have issues, either a weak pump or wiring.
higher pressure WILL cause a slight increase in fuel flow per time unit that they're opened, but well within O2 sensor correction range.
the HO alt getting better fuel economy..... maybe. his old alt could have been quite lossy and putting in a new one could have free'd up a little bit of drag on the engine. the alt could also be operating in a more efficient range. hard to say.
as for the "volt booster"...... if you like running on the ragged edge of frying electronics, especially your battery, by all means, go ahead. the alt's regulator is already targeting ~14.4 volts, pushing that into the 15 or 15+ range is a good way to turn what could have lasted 5-10 years into a yearly replacement item.
the way it works, BTW, is that it drops externally sensed voltage by x amount to trick the regulator into running a higher duty cycle to maintain "14.4". this will show up as more drag on the engine.
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