Bio-Generators produce electricity from Bio Fuel. The generator will produce 5.6 kJ from a single item, and has an internal storage capacity of 160 kJ. After this has been reached, the bio-generator can hold 24000 units of bio fuel to be processed later, which is equivalent to 240 items.
22 pieces of wheat, reeds, potatoes and Carrots, 44 pieces of biofuel produced. (Reeds is the ideal item to be crushed due to the easy expansion and growth rate.)
With speed boost: total of 6.5kJ used with 1kJ left in the machine, 5.5kJ used to produce bio fuel.
5.5 / 22 = 0.275 kJ per wheat
Without speed boost: total of 23kJ used with 1 kJ left in the machine, 22kJ used to produce bio fuel.
22 / 22 = 1kJ per wheat
1 bio fuel = 5.6kJ, therefore 44 * 5.6 = 246.5kJ produced 246.5 - 5.5 = 241 net kJ produced with speed boost 246.5 - 22 = 224.5 net kJ produced without speed boost 241 / 5.5 = 43.8 kJ produced per 1 kJ used 224.5 / 22 = 10.2 kJ produced per 1 kJ used