It’s like any other plug-in hybrid Jamie. The official fuel consumption is nonsense and what you will achieve depends entirely on how you use it. If you never do more than 25 miles a day and charge up every night, you can have 5000 mpg because you never have to start the engine. If you mostly drive long distances you will get worse fuel consumption than the regular petrol engine version because of all the extra weight you’re hauling around. Most people will get something in between!