Milage can simply solved with testing some pipes or look what others use. The 2013 is an awesome pipe to make the 5min easy if you are alowed to use it (Within the EFRA it is illigal)

Beside that with todays engines it is most of the time difficult to get the 5 minutes so that was the reason for the EFRA to go to a 7 minute qualification to be sure you have to make a fuelstop.