Hi All,
I've just now uploaded a file to the AVSIM library (Dash8Q400FuelPlan.zip) that contains an excel (2010 or later) spreadsheet that can be used as a fuel planner for the Q400. The data within it is courtesy Bob Scott and the calculations I wrote myself. Let me know via PM if there is anything way off about the calculations. Give it a few hours to pass inspection and then you can download it.
Enjoy!