Don Stauffer wrote:
In general, electrical conversion (alternator/motor/wiring) is
significantly more efficient than a hydraulic system of the same
size/weight/cost. You can make hydraulics a bit more efficient by very
precise machining, removing as much compliance from the tubing as
possible, electronic controls, etc., but it hits a point of diminishing
returns and there is always the frictional loss of pumping fluid around
when its not being used for assist.