I think we are on the same page, although your book may be "the fundamentals of engineering principles" where mine might be "how to draw funny cartoons".
I don't think series hydraulics have the efficiencies for good highway mpg's. But I see some advantages in brake regen with a parallel hybrid set-up, mostly in being able to undersize (more) the engine. I think there would be very few places where it would make sense to use an ice to charge a hydraulic system to propel a car. Especially if the driver were a hyper-miler type.
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