When going downhill, a hybrid essentially coasts. If you don’t need to accelerate faster, a significant percentage of the vehicle’s kinetic energy will be transfered back into the battery (along with some of the heat which would normally be lost in braking) but the efficiency is probably below 50%. The amount of energy would depend on the height of the hill, with the ideal maximum amount being the weight of the car multiplied by the height of the hill (potential energy), but again the car will not likely be able to harness more than 50% of that maximum due to friction and other entropic processes.
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