How do the new 64 ounce containers treat the same amount as the 80 ounce containers?

The 64 ounce and 80 ounce bottles both treat 250 gallons. The 64 ounce bottle is slightly more concentrated to allow it to treat the same amount of fuel as the 80 ounce bottle. As long as you follow the directions on the label you are getting the exact same amount of active ingredients added to your fuel, and it will perform exactly the same.