Fuel Combustion 36 Power resources 13 Automobiles 6 Equipment and supplies 6 Fuel switching 6 Gas-turbines 6 Terminology 5 Testing 5 Airplanes 4 Energy conservation 4 Fluid dynamics 4 Fuel consumption 4 Internal combustion engines 4 Motors 4 Renewable energy sources 4 Coal gasification 3 Cogeneration of electric power and heat 3 Contamination 3 Design and construction 3 Gasoline industry 3 Greenhouse gas mitigation 3 Handbooks, manuals, etc 3 Liquid propellants 3 Performance 3 Quality control 3 Rockets (Aeronautics) 3 Solid propellants 3 Alternative fuel vehicles 2 Briquets (Fuel) 2