I talked to Edge today. Level 5 on low fuel boost is how the Juice without Attitude is set. Levels 4-1 are delays of when the fueling boost begins. At low fuel boost level 5, fueling enhancement fully begins as soon as you step on the pedal. On level three, there is something like a 30% boost off idle, but you don't get the full boost until about 7.0 PSI from the turbo. On level 1, you don't get full fueling boost ontil 10 PSI on the turbo.
I set mine back to 5/5. I have got as good as 21.9 mpg with the reg Juice on level 4. As long as I drive like an adult, I'll get the same mileage with the Attitude. Edited by: afp1