To clarify the fuel penalty discussion:
The Live2Air installation adds between 450 and 550 kg to the aircraft's BEW, obviously a little more on the 800s than the 700s. This is expressed in higher ZFWs entered into the fligt plan. Typically this results in an additional burn of about 15kg on a short sector (Mel-Syd, Syd-Bne etc which are the majority of ops).
To account for aerodynamic degradation, all Live2Air flights are flight planned with a PDA (Performance Degradation Allowance) of 1.2%. This means that ON TOP OF the fuel burn resulting from the added weight the bump results in a fuel burn higher than the equivalent aircraft operating at the same (higher) weight. That puts an additional burn of 33kg on each Mel-Syd flight.