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Conventional fuels commonly used in cars with combustion engines and the effects of their combustion have a very negative impact on the state of the environment. The combustion of liquid fuels causes the introduction of many thousands of tons of CO₂ and other harmful substances into the atmosphere every year. That is why the authorities of many countries are introducing more and more stringent emission standards for cars with internal combustion engines, and car manufacturers are trying to meet these standards. Therefore, the aim of the undertaken research was to compile and analyze the power of spark engines in individual capacity ranges, compression ratios, efficiency, CO₂ emissions, dependence of combustion on engine capacity, dependence of CO₂ emissions on engine capacity, and dependence of combustion on engine power. The conducted research also compared the level of average selected variables related to CO₂ emission in terms of engine displacement by country of production using statistical analysis.