E85 fuel car (4 questions)?

1.Other than these marks, Chrysler, Ford, General Motors, Isuzu, Mazda, Mercedes, Mercury, Nissan, are any other comapanies such as Subaru planning to make e85?

2. How is e85 made. What is it made out of other than corn?

3.Are there any pros and cons about e85?

4.Like the hydrogen fuel cell car can i make home made e85? Can i make a mini car and test?