Research background: Quality is about fulfilling customer expectations. Service quality is an important element in the functioning of a company, in this case a petrol station. Purpose of the article: The aim of this study is to research the level of consumer satisfaction using the Customer Satisfaction Index (CSI) method on the basis of petrol stations. Methods: On the basis of the questionnaire, the CSI index was calculated, which uses ratings and weights, i.e. the importance of individual characteristics relating to the petrol station. The subjects of the survey were respondents of different ages, living in different areas, with different educational backgrounds, with different driving status, filling up with different types of fuel, driving different numbers of kilometres, taking different routes and using different cars. A group of 170 people took part in the survey. Findings & Value added: Consumer satisfaction surveys make it possible to show the strengths and weaknesses of the operation petrol stations. This allows these organisations to control factors and continuously improve the quality ofthe services they offer.