The Gas Technology Institute (GTI and formerly known as the Gas Research Institute or GRI) and the Pipeline Research Council International (PRCI) jointly sponsor a comprehensive flow measurement research, development, and commercialization program aimed, in large part, at improving natural gas metering performance in the field. Recent research has focused on developing new, more cost-effective technologies, as well as improving conventional measurement technologies. This article summarizes recent research efforts in support of the GTI/PRCI program conducted at the Metering Research Facility (MRF) located at Southwest Research Institute (SwRI) in San Antonio, Texas. The MRF is a highaccuracy natural gas flow calibration laboratory capable of simulating a wide range of operating conditions for the industry’s research, calibration, and testing needs