E85 is a fuel suitable for “flex-fuel automobiles.” It's composed of 85% ethanol and 15% gasoline. E85 pumps are clearly labeled at fuel stations and typically have yellow nozzles. The octane ranking of gasoline lets you know the amount the fuel could be compressed before it spontaneously ignites. Justin Sullian/Getty https://jaroslava050sjz6.wikitidings.com/user