TOYOTA 2011 Prius - Manual (Page 292)

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2-5. Driving information
PRIUS_U (OM47685U) DVD
Example on your vehicle
Cargo capacity
Total load capacity
When 2 people with the combined weight of 366 lb. (166 kg) are
riding in your vehicle, which has a total load capacity of 825 lb. (370
kg), the available amount of cargo and luggage load capacity will be
as follows:
825 lb. — 366 lb. = 459 lb. (370 kg — 166 kg = 204 kg)
In this condition, if 3 more passengers with the combined weight of
388 lb. (176 kg) get on, the available cargo and luggage load will be
reduced as follows:
459 lb. — 388 lb. = 71 lb. (204 kg — 176 kg = 28 kg)
As shown in the above example, if the number of occupants
increases, the cargo and luggage load equaling the combined weight
of the occupants who got on later, by an amount. In other words, if an
increase in the number of occupants causes an excess of the total
load capacity (combined weight of occupants plus cargo and luggage
load), you must reduce the cargo and luggage on your vehicle.