This paper focuses on modeling trends in the consumption of Compressed Natural Gas (CNG) as a sustainable fuel in road transport and its comparison with traditional Diesel propulsion. The paper aims to assess the divergence between CNG and Diesel in terms of fuel efficiency and environmental impact, based on an analysis of historical consumption data from 2015 to 2020. The research uses time analysis and linear regression to predict consumption until 2030. The divergence method quantifies the difference in the rate of development between the two fuels, while bibliometric analysis points to research interest in topics such as emissions, combustion and alternative fuels. The results confirm a clear and growing divergence in consumption: CNG usage declined significantly from 5.2 to 4.5 kg per 100 km, while Diesel consumption dropped only slightly from 8.4 to 8.0 liters per 100 km. Prediction models suggest that by 2030, CNG vehicles will reach 3 kg/100 km, whereas Diesel vehicles will maintain levels above 7 liters. These findings indicate dynamic technological progress in CNG propulsion systems compared to the relative stagnation in Diesel efficiency. In parallel, bibliometric analysis reveals that CNG is a central theme in alternative fuel research, most notably in Asian countries such as India, Pakistan, and China, where urbanization and environmental pressures drive innovation. Keywords like “performance,” “combustion,” and “emissions” dominate the academic discourse, further reinforcing the fuel’s relevance. The combination of empirical data and global research trends supports the conclusion that CNG represents not only a technologically and environmentally superior option, but also a research-backed pathway toward low-emission and cost-effective road transport.