Most often, the lower mileage will be on a newer car. Not always but mostly.
Over here, the newer the car the higher the taxation.
One way I advise fellows to keep their costs manageable is pay attention to rebadged models e.g. Toyota Dyna/ Hino Dutro, Nissan Vanette/ Mazda Bongo/ Mitsubishi Delica, Isuzu Elf/ Nissan Atlas/ Mazda Titan T7000, Mazda Premacy/ Nissan Lafesta, Mazda Bongo Brawny/ Toyota Hiace H200, Nissan ADVan/ Mazda Familia Van/ Mitsubishi Lancer Cargo, Nissan NV350/ Isuzu Como/ Mitsubishi Fuso Canter Van, etc.