Existing road tax rates apply to all new vehicles registered before 1 April 2017. New road tax rates apply to all new vehicles registered from 1 April onwards. Official government fuel consumption figures in mpg (litres per 100km) for the Mercedes-Benz range: urban 16.2(17.4)-72.4(3.9), extra urban 23.9(11.8)-88.3(3.2), combined 20.5(13.8)-134.5(2.1). CO2 emissions 322-48 g/km. Mercedes-Benz UK Cars Limited. is a company registered in England and Wales with company number 2448457 and has its registered office address at Tongwell, Milton Keynes, MK15 8BA.