"Depends on the composition of the fuel. If the fuel is carbon based, most of the exhaust will consist of carbon compounds, such as carbon dioxide, carbon monoxide, hydrocarbon, and soot."@en . . "Depends on the composition of the fuel. If the fuel is carbon based, most of the exhaust will consist of carbon compounds, such as carbon dioxide, carbon monoxide, hydrocarbon, and soot."@en . . "What is left when a fuel finishes burning"@en . .