“Gasliner” multifunctional mobile CNG refueling system, operating as a unified device, allows performing compression, storage, transportation of Natural Gas and fleet refueling with CNG. The integration of 4 functions in one device decreases the CapEx significantly, compared to other off-pipeline CNG solutions. One full-sized “GasLiner” mobile system provides highly efficient simultaneous “parallel” CNG refueling of up to 50 MDV’s within 90 minutes. Unlike other CNG refueling trailer solutions, one “GasLiner” trailer refuels CNG fleet with rate of 4200 m3/hour (or 70 DLE (diesel litre equivalent)/min) and unloads 98% of the total transported gas. “GasLiner” unique technology of “Multifunctional Liquid Piston” is the key to cost efficiency and refueling convenience. Our technology is already patented in 30 countries, including USA, Canada, Japan, China and other countries of Europe, Asia and Latin America. It has already undergone field-testing in the framework of the pilot project and has proved its reliability and a number of distinct advantages over other off-pipeline solutions.