The article delves into the use of alternative fuels, particularly ethanol and natural gas, in the transportation industry. Ethanol, a biofuel blend of gasoline and ethanol, offers cost savings for fleet owners due to its generally lower price compared to gasoline. However, the lower energy content of ethanol results in reduced fuel efficiency, impacting its cost-effectiveness. Natural gas, including compressed natural gas (CNG) and liquefied natural gas (LNG), provides cleaner combustion with controlled emissions, offering performance similar to traditional fuels. CNG is recommended for high-mileage applications, while LNG is suitable for long-haul journeys despite its limited availability. While both fuels present environmental advantages over traditional gasoline and diesel, challenges such as the limited LNG fueling infrastructure compared to CNG stations hinder widespread adoption. Overall, alternative fuels like ethanol and natural gas offer cleaner and more sustainable options for the transportation sector, albeit with varying efficiency and availability considerations.