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Hutchinson Utilities owns and operates a natural gas transmission pipeline in Minnesota. As new wells are tapped & introduced to the supply gas composition can change. Hutchinson had to refund $1.8M in over-billing of natural gas usage during a 2 year period due to a difference between Hutchinson's customer's volume flow measurement and Hutchinson's Coriolis mass flow measurement, which saw as high as a 7% difference due to changes in composition. As a result, they installed Micro Motion Gas Specific Gravity Meters (SGM) on interconnect stations to correct in real-time their mass flow measurement to a corrected gas standard volume flow measurement and eliminate billing discrepancies. A 5% difference in gas specific gravity results in 5% difference in volume measurement.