The displayed electric range, as with the remaining range or 'miles to empty' display on a petrol vehicle, is a calculation based on the available charge in the battery but also recent energy consumption, so a full charge will not necessarily produce an electric range figure that is equal to that quote by the manufacturer. When manufacturers advertise the available range of their vehicles it is always prefaced with 'up to XXX miles' to reflect the fact that available range is variable and impacted by battery health, ambient conditions and driving style and cannot be guaranteed under all circumstances.

While it is unlikely that you have been sold a standard range vehicle rather than an extended range model, we would suggest looking at the documentation supplied from new to confirm the model specification. You can also search online for a Volvo VIN decoder and check your vehicle's VIN which should give you a breakdown of its specification.