DA told me that regular not premium or high octain is the fuel to use. The shell station or for that matter any station would be in trouble if it sold leaded fuel so the 110 octainim im sure is lead free but ill double check. a lot of the ninja bike guys use this fuel due to the nice smell as much as the added performance. I was just curiouse and wouldnt mind having The DA perform a tad better it sounds like it has a touch of preignition noise. Thank you for your input