With Note 48, QuantityWare delivers a second crude oil MQCI model, where the masses and weights are calculated as net masses and weights. The current crude oil MQCI model calculates the masses and weights as gross masses and weights. The calculation of both net and gross standard masses and weights is defined in API MPMS Chapter 12.1.1 “Calculation of Static Petroleum Quantities” Upright Cylindrical Tanks and Marine Vessels.