How would I add fuel to be used in furnaces and things that use fuel?

like this in your mod_xxx class.

 

 
    /**
     * Override if you wish to provide a fuel item for the furnace and return the fuel value of the item
     * 
     * @param id
     * @param metadata
     * @return
     */
   public int addFuel(int id, int metadata)
    {
        return 0;
    }

 

 

 

so if you had multiple fuels you could do it like this:

 

   public int addFuel(int id, int metadata)
    {      
      switch(id) {
         case fuelitem.shiftedIndex:
             return 1600; //Same As Coal
            
         case fuelitem2.shiftedIndex:
             return 20000; //Same as lava

         default:
            return 0;
             
         }
    }

ah that is why the old modloader.Addfuel no longer works