@bentune: I had the opportunity to demonstrate what bad fuel can look like in a datalog with this C6 Corvette. it's a nearly stock car with just exhaust that needed a quick touch-up to the tune, but it demonstrated a large amount of knock. it's important to determine if the knock is real or false before you start desensitizing your sensors. One of the quickest and easiest ways is with a high quality fuel additive or pumping some known good fuel into the car after draining the tank. for me, where I live, it's much easier just to keep a couple bottles of VPs additive on hand because it's difficult to get quality fuel here, especially late at night like when I'm trying to get this car done. #bentune #hptuners #dyno #tuning #dynotune #GM #Chevrolet #Chevy #Corvette #C6 #6speed #racecar #streetcar #vpracing #fuel #additive #Tuesday #work #latenight #LFG