Here'e the effect of using petron super unleaded E10 on my 2010 Genesis Coupe 2.0turbo.... the mechanic at Hyundai Commonwealth said the "pak-pak-pak" sound was "fuel knock". That seems logical since that never happend when i was still using Blaze. I'm gonna fill up with blaze as soon as the tank's empty to see if the sound goes away.

[ame="http://www.youtube.com/watch?v=vdhZ6vMjMtY"]YouTube- Genesis turbo clicking sound[/ame]

[ame="http://www.youtube.com/watch?v=SZQjSV8T7Zs"]YouTube- Genesis Turbo knocking[/ame]