what is e 85 gas

E85 gas is a high-level combination of ethanol and gasoline that consists of 51 percent to 83 percent ethanol blended with gasoline. The percentage of ethanol depends on the geography and season. E85 is the most common form of flex fuel available on the market and is readily available in the Midwest region of the United States. E85 has an octane rating higher than that of regular gasolines typical rating of 87, or premium gasoline's 91-93, which allows it to be used in higher-compression engines, producing more power per unit of displacement than their gasoline counterparts. However, E85 has less energy per gallon than gasoline, leading to fewer miles per gallon. E85 should only be put in certain vehicles, called flex fuel vehicles (FFVs), which have a fuel delivery system and engine that are designed to use it. E85 is usually cheaper than gasoline, and it burns much cleaner, releasing fewer air pollutants into the atmosphere. However, E85 is not as widely available in some parts of the United States.