Charcoal has higher calorific value per unit weight ( 31.8 MJ per kg ) compared to fuelwood ( 16 MJ per kg ) ; .
Charcoal is smaller and easier to store .
Charcoal has higher calorific value per unit weight ( 31.8 MJ per kg ) compared to fuelwood ( 16 MJ per kg ) ; and charcoal is smaller and easier to store .