E85 is a type of fuel that contains 85% ethanol and 15% gasoline. It is designed for use in flexible fuel vehicles (FFVs), which are specially built to run on high-ethanol blends. Ethanol is a renewable fuel made from plant materials, making E85 a more environmentally friendly option compared to traditional gasoline. Using E85 can reduce greenhouse gas emissions and dependence on fossil fuels. However, it may not be suitable for all vehicles, as it can lead to decreased fuel economy and performance in engines not designed for high ethanol content. Drivers should check their vehicle specifications before using E85.