1. Different fuels have different energy densities defined by the fuel's heating value . 2. Mockernut has the second highest heating value among the species of hickories. 3. Many engine manufacturers rate their engine fuel consumption by the lower heating values . 4. The International Energy Agency reports the following typical higher heating values : 5. The higher heating value is experimentally determined in a bomb calorimeter. 6. Noncombustible carbon dioxide ( CO2 ) lowers the heating value of natural gas. 7. AR, MF, and MAF are commonly used for indicating the heating values of coal: 8. High concentrations of petroleum products in soil can result in high soil heating values . 9. A methane output of approximately 30 kW ( higher heating value ) is targeted. 10. For the purpose of increasing the heating value , injecting propane and butane is a solution.