My understanding is that all control is related to max torque.
I only get 10 to 11 psi when running inferior fuel. I have completely switched to QT regular and routinely get 15 to 16 psi max boost.
Truthfully I do not know what that means
Engine needs more boost to hit max torque would tell me the fuel is worse not better. Color me confused.
1.4 manual is stock except for air intake.