All i have to say on this one is you got to work your foot!
When you fill it starting to spin tyers pump gas 2 times then back to full ect.. thats what i do it works pretty well for me, only problum i realy have is keeping a good line and staying on it evry lap, and staying with the grop cus ones you lose the grop your almost helples, there all up there drafting pulling awhwy...