Clearly the savings is to alternate each engine off/on while in flight.
To use much ai you almost need to know something of the correct answer first given some of the things they posit. I had one score a church assessment I did for a group and it didn't do the simple math correctly. I looked at it and thought that can't be right. Asked again, same answer. Finally told it that it was wrong, it was still sure it was. I pointed out how and where and it agreed. Obviously by then I could have done it myself.... How does a super computer not know how to do simple math? If I can do it, a computer surly can.
It's humorous at times. Might ask about Roto 66s and come back with a tonal profile that they are scooped, of some other clearly false statement.