I don't own a Titan, I own a 2008 Pathfinder V8. I think it's got the same engine as the Titan.
The book isn't exactly clear about what fuel I should use. They use two different measurements in the book, but the numbers are kinda close to one another so I'm not sure what to go by - I live in the US.
I *think* it says I should not use fuel under 91 octane. But does that mean I SHOULD try to use 93? Or that it's perfectly tuned for 91? Or what?
The dealership seems just as clueless as I am. (which is pretty bad..)