na thats really good tbh mate, i dragged 31mpg out of my ZS on my trip to and fro from santa pod, fully loaded too. Don't immediately think that the slower you go the less fuel you use.....i can plod at 80-85mph on a flat road with the engine unloaded and pull 45mpg!! <<difficult to keep it to that with inclines etc! yet only pull 30mpg odd at 50-60mph... strange ah? guess your making the engine load harder therefore using more fuel