Just to clarify , I don't not think there is an EC130 version that can carry 8 pax plus pilot. As IC pointed out Maverick fly the 8 seat version that carries 7 pax plus pilot . Most of the tours seem to be 3.5 hours with a landing for snacks. So I would assume they can do 2.5 fllight hours fully loaded ( I don't think they refuel in the canyon) . I am not sure if they tend to load the lighter people in the front seats to avoid c of g issues. I do know that many of the operators weigh the passengers to ensure they are flying within limits.
https://www.bluehawaiian.com/about/b...t_helicopters/
BH fly 7 seat config , I expect due to the extra weight of the flotation gear.