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Look under the hood of any Ford Focus made in the last 5 or so years and you will see a return less system. Sensor at the front of the fuel rail, sends signal to ECU, which sends a signal to the fuel pump modulator, which controls voltage to the in tank pump.
Smart alternators will eventually go into full charge when engine is in DFCO and AC compressor is not cycling, then if that is not sufficient charging will max during higher vacuum parameters.
Stop start alternators will have much greater capacity to charge quickly and will really pump the juice in a larger capacity battery under forced deceleration.
I still think lower displacement with electric supercharging under high loads will be a factor, especially with start stop alternator-starter systems and higher capacity lightweight batteries.
regards
Mech
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