Thanks for all the details. Can you hear the blow off valve when you drive or is it only while driving aggressive?Yes, that's right, I'm in MB. My L/100km currently is as follows, to the best of my recollection:
In summer, with AC on: 11.5-13.5
In summer, with AC off: 9.5-11.5
In winter, with heater/seat heater/steering wheel heater on: 13-14.5
In winter, with heater only: 12.5-13.5
I have the display set up to show me the mileage for the current trip upon vehicle shutdown. I fuel using Shell 91 "V-Power" only. This is based on an average of 40km per day, mostly driving to work and back home. I would consider myself slightly more aggressive than the average driver around here, but I don't stomp on it everywhere I go. I also have the Sprint Booster installed (usually set to "Race 7"), and 22x10.5 wheels with 285/35 tires that happen to be a few pounds lighter than the OEM 20x8.5 and 255/50 tires. I think the mileage difference between summer and winter is due to the gas stations switching between summer and winter blends.
After adding the intake, there was a very slight improvement in mileage, but nothing significant. Maybe 0.1-0.2 improvement? In my experience of course, YMMV.