Well it is also burning oxygen from air which you don't carry on the helicopter. Let me see how much high school chemistry I still remember... CO2 = C (12

Well it is also burning oxygen from air which you don't carry on the helicopter. Let me see how much high school chemistry I still remember... CO2 = C (12) * 1 + O (16) * 2 So 1 lb of C from fuel => 3.67 lb of CO2 out Suppose AvGas is just Octane, C8H18 C8H18 = C (12) * 8 + H (1) * 18 1 lb of octane => 0.84 lb of C => 3.09 lb of CO2 So yeah, you get 3 lb CO2 from 1 lb of octane.