Fuel consumption is around 30 better than the DI engine and 40 to 50 better than the earlier carb models. One of the biggest changes is the introduction of the new ST3 hull for the GTX 155230 GTX Limited 230300 Wake Pro 230 RXT 230 the RXT-X 300. 2003 Sea-Doo Jet Boat Sportster LE - YouTube.