PC12togo,
I am a fan of the PC12, but I believe your figures are far from correct.
$540 per hour direct operating costs ?, does that take into account the capital expenses / loan repayments / hot sections inspections etc etc ?.
A Caravan costs considerably more that that to operate, somewhere around the $900 mark, based on 800 odd hours per year, hence the Charther rate of $1000-1150.
If you believe the $540 to be correct could you please post the figures.
I agree with your fuel figures and TAS numbers stated.