This tank is like mine. It holds 12 more ounces of fuel meaning 12 more ounces past the middle line. The cap is higher in the air. After about 6 laps all the fuel is pushed towards the gas cap from inertia. If you fill it to high the fuel will cover the fuel cap cutting of the air and it vapor locks. This tank helps with that problem simply because the cap is higher in the air. Not all tech men know. Happy caps work most of the time.