CNG Cars are difficult to maintain
CNG Cars need specialised Garages. I had one (living near Ravere) and could not more drive. No repair in Rakvere possible. Had to transport the Cat to Tallinn which has cost more ten 500€ plus repairs for around 200€. CNG Cars are dropped in favor of LPG cars which are easy to maintain and a network of repair Garages is availlable.