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Validation of PG+W
NIST and other calibration laboratories have validated that flow measurements made in a 5 % propylene glycol + water (PG+W) mixture are within the uncertainty of measurements made using Stoddard solvent over the usable range of the turbine meter. 
 J. Wright, A. Johnson, G. Kline, C. Crowley, J. Pope, V. Bean, et al., A Comparison of 12 US Liquid Hydrocarbon Flow Standards and the Transition to Safer Calibration Liquids, Cal Lab Magazine: The International Journal of Metrology, vol. 19-2, pages 30 – 38 (2012).
 J.G. Pope, J.D. Wright, A.N. Johnson, M.R. Moldover, Extended Lee Model for the Turbine Meter and Calibrations with Surrogate Fluids, Flow Measurement and Instrumentation, vol 24, pages 71 – 82 (2012).