In order to determine the feasibility of using the heat of compressed natural gas to regenerate the sorbent, an investigation of gas drying with silica gel at 20 MPa and regeneration of the silica gel at relatively low temperature in a pilot unit was performed. Prior to this drying method, in automotive gas-filling compressor stations, compressed natural gas was subjected to drying in adsorption units using NaA zeolite as the drying agent. This created problems in operating the units and increased the energy costs. The authors determined the moisture contents of the incoming gas and the dried gas on the basis of the dew point and by means of a KIVGL instrument. The results from these studies are presented.