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This would be beneficial in situations where you are traveling a long slight downgrade where there's no concern about scrubbing speed at any point. It will eliminate the normal losses associated with spinning the mass of the trans gear train. The gains associated with approaching lights on high speed roadways would be nominal. As noted, an injected motor doesn't add fuel when there's no load (i.e. coasting). The transmission spins the crank if the torque converter is locked. If it's not, it's fluid coupled which is a huge waste of energy.
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