It doesn't matter what gas you put in it. If it runs rough go back into the gas station and get a bottle of NOS. It’s in a blue bottle with a orange cap, they keep it in the cooler next to the energy drinks because that where the Gixxer riders head first and that's their target audience and it works better when it's chilled. Works like a cold air intake except in the fuel. Pour that into your tank and your all set. If you want a extra boost of Powa pour in 2 bottles and you'll be the fastest mofo on the road.