Ethanol fuels are a renewable and environmentally friendly alternative to fossil fuels for cars. They have been proven to be energy-efficient, cost-effective, and can be produced in large quantities without impacting food supplies. Ethanol fuel technologies have been well-established in countries like Brazil and the United States for the past 30 years. Ethanol-blended fuels with different ethanol levels are already in use, along with flex-fuel vehicles that can run on varying ethanol mixtures. These fuels have positive impacts on the environment, reducing air pollution and greenhouse gas emissions. New developments in ethanol fuel vehicles are also on the horizon.