No, you cannot purchase additional mileage for your Care by Volvo cars subscription. However, you are allotted 1,250 miles per month, which comes out to 15,000 miles per year (as long as you don't cancel your subscription early). If you go over this monthly allotment, you will be charged 25 cents per mile upon returning your vehicle at the end of your subscription. It does give you the option to go over, as long as you are prepared to pay this extra amount.