https://docs.emtronaustralia.com.au/engine-management/config/air-mass/air-mass-user1/index.htmlOverview Air Mass User 1 allows the user to create a custom air mass calculation by combining two independent air mass sources. The resulting Air Mass User 1 runtime can then be used throughout the ECU wherever an air mass value is required. A Blend Table is used to determine the contribution of each source to the final air mass value.Hugoen-us