That's what it's called right? When after the normal half second of slight lag the turbo hits hard, suddenly and inconsistently... Well, that's the symptoms anyway, but that may be because I only put a couple hundred miles on after the ECO reset that went along with the res delete. Then I accidentally put regular in and it's much smoother now, takes longer for boost to build, but definitely smoother driving... Strange. Well, just goes to show that a tune, even a Stage 0 may be required for our cars to run right on anything but regular. Stock, it adjusts timing with premium, but to where it takes away drivability, however enthusiasts may like the hard sudden turbo hit that way, I know I would if I didn't drive Lyft sometimes.