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Hi Ella,
LEAP contains only a default fuel database. But you can modify the properties of these fuels, or add your own customized or region-specific fuels.
Click on the 'Fuels' icon in LEAP's toolbar. In the dialog box that appears, click the green '+' sign to add a new fuel, and specify it's state (solid, gas, etc...). You are then free to modify its properties by entering the appropriate values for the fuel, from within the Fuels database.
Good luck,
Taylor