The probable reason why most of us have bought a Phev (apart from the obvious BIK for company cars) is for fuel savings. I'm a predominantly short trip user and I filled up the car over 2 weeks ago, I've done 255 miles since and the fuel tank is still full!! not sure what mileage i'll have done by the time the tank is empty but it will work out at shed loads to the gallon by the time it is!