a prime road tax to partially compensate the State for the loss of revenue. Instead LPG cars pay a prime road tax in Belgium, because LPG is totally exempted from excise duties. Since CNG is not totally exempted of excise duties, in Belgium it is allowed to connect a car to the home network of natural gas and to refuel the car from home. The purchase of CNG cars is not subsidised by the government, but by the Belgian producers and distributors of natural gas. Fiat and Volkswagen sell factory-equipped CNG-cars in Belgium. At the end of 2018 there were 11,188 vehicles running with CNG in Belgium. In Germany, CNG-generated vehicles are expected to increase to two million units of motor-transport by 2020. The cost for CNG fuel is between 1/3 and 1/2 compared to other fossil fuels in Europe. In 2016 there are around 900 CNG stations in Germany and major German car manufacturers like Volkswagen, Mercedes, Opel, Audi offer CNG engines on most of their models. Augsburg is one of the few cities that only run CNG operated public buses since 2011. In Turkey, Ankara municipality is increasingly using CNG buses, where numbers have reached 1090 by 2011. Istanbul has started in 2014 with an order of 110 buses. Konya also added 60 buses to its fleet the same year. In Portugal, there are 9 CNG refueling stations as of September 25, 2017. In Hungary, there are four public CNG refueling stations in the cities Budapest, Szeged, Pécs and Győr. The public transportation company of Szeged runs buses mainly on CNG. In Bulgaria, there are 96 CNG refueling stations as of July 2011. One can be found in most of Bulgaria's big towns. In the capital Sofia there are 22 CNG stations making it possibly the city with the most publicly available CNG stations in Europe. There are also quite a few in Plovdiv, Ruse, Stara Zagora and Veliko Tarnovo as well as in the towns on the Black Sea – Varna, Burgas, Nesebar and Kavarna. CNG vehicles are becoming more and more popular in the country. The fuel is mostly used by taxi drivers because of its much lower price compared to petrol. Currently (as of July, 2015) the city of Sofia is rapidly renewing its public transport fleet with MAN Lion's City buses running on CNG. Also, many companies switch to CNG cargo vans and even