The goal of this study was to investigate the technical and economic feasibility of producing synthetic pipeline gas from oil shale using HYTORT Process. The technical and economic feasibility of the process was shown in laboratory-scale, bench-scale, and PDU-scale (1-ton/hr process development unit) equipment in tests with both Eastern and Western U.S. shales. With Western shales, 95% or more of the organic carbon conversions up to 90% were achieved. In addition to showing the overall technical and economic feasibility of the process, this study showed the technical and economic feasibility of a novel, patented method for feeding shale to and from high-pressure reactors. Based on the results obtained, it now appears that the Eastern U.S. shale resource (largely neglected in the past because of the low yield by the conventional Fischer Assay method) is now economically recoverable.