What gas is formed when octane is burned in engines?

When octane (C8H18) is burned in engines, it primarily produces carbon dioxide (CO2) and water vapor (H2O) through the combustion process. However, incomplete combustion can also generate carbon monoxide (CO) and various hydrocarbons, along with nitrogen oxides (NOx) due to the high temperatures in the engine. The overall reaction highlights the environmental impact of burning fossil fuels, contributing to greenhouse gas emissions and air pollution.