Vacuum tires for electric vehicles are the same as those for automobiles. Generally, new tires are full of gas, and there is no need to inflate them twice in a year and a half. So don't worry about air leakage. If there is a leak, it proves that there is something wrong with your tire. If you refuel, it will be just like a normal tire. It is recommended to refuel after sale, because they are all free and don't need to be used in vain.