E85 is a type of ethanol-blended gasoline that is made up of 85% ethanol and 15% gasoline. It is commonly used as a gasoline alternative in vehicles that have been modified to run on ethanol. E100, on the other hand, is pure ethanol and does not contain any gasoline.

One of the main differences between E85 and E100 is the energy content of the fuels. E85 has a lower energy content than regular gasoline due to the lower energy content of ethanol compared to gasoline. As a result, vehicles that run on E85 may have slightly lower fuel efficiency than those that run on regular gasoline. E100 has an even lower energy content than E85 and may have even lower fuel efficiency.

Another difference between E85 and E100 is the availability of the fuels. E85 is more widely available than E100 and can be found at fuel stations that have a separate dispenser for E85. E100 is less widely available and may be more difficult to find.

E85 and E100 can offer some environmental benefits compared to regular gasoline, due to the lower emissions of greenhouse gases associated with ethanol. However, the production of ethanol from corn and other plant materials can have environmental impacts, such as land use changes and water pollution.

It’s worth noting that E85 and E100 are not suitable for use in all vehicles. They are typically only suitable for use in vehicles that have been specifically designed to run on ethanol, such as flex-fuel vehicles. Using E85 or E100 in a vehicle that is not designed to run on ethanol can cause engine damage and other problems.