The bill promotes low-carbon, high-octane fuels like ethanol to enhance automobile efficiency and reduce emissions, emphasizing cost-effectiveness and climate-smart practices. It regulates fuel standards for high-octane vehicles, impacting manufacturers, retailers, and consumers, requiring testing and certification of vehicles and establishing mandates, prohibitions, and penalties. The bill amends acts to regulate automotive fuel certification, display, and sales, infrastructure standards, and compliance with Clean Air Act waivers. It also introduces a 'Clean Octane Standard', 'Low-Carbon Octane' prohibition, and revisions to fuel economy and greenhouse gas standards to reduce emissions and improve efficiency, impacting automotive and fuel industries, and aiming to reflect current technology and environmental considerations.