An apparatus comprising: one or more memories (1914, 1916) comprising computer readable instructions; and one or more processors configured to execute the computer readable instructions to: determine a current amount of fuel required without halt and a current fuel consumption rate for a machine during a harvesting event in a field based on a first amount of fuel required without halt, a first fuel consumption rate, and real time information from sensors of the machine; and determine a real time amount of fuel required based on the current amount of fuel required without halt, the current fuel consumption rate, and a halt time for the machine during the harvesting event, the one or more processors to use the real time amount of fuel required to schedule fuel delivery for the machine; wherein the one or more processors are configured to execute the computer readable instructions to obtain an aerial image of the field and determine field metrics from the aerial image, the field metrics including at least one of an area of the field, a total throughput of the field, and a number of turns in the field; and wherein the one or more processors are configured to execute the computer readable instructions to determine, using an offline model calculator, the first amount of fuel required without halt and the first fuel consumption rate for the machine before the harvesting event based on historic field data and the field metrics determined based on the aerial image of the field. one or more memories (1914, 1916) comprising computer readable instructions; and one or more processors configured to execute the computer readable instructions to: determine a current amount of fuel required without halt and a current fuel consumption rate for a machine during a harvesting event in a field based on a first amount of fuel required without halt, a first fuel consumption rate, and real time information from sensors of the machine; and determine a real time amount of fuel required based on the current amount of fuel required without halt, the current fuel consumption rate, and a halt time for the machine during the harvesting event, the one or more processors to use the real time amount of fuel required to schedule fuel delivery for the machine; wherein the one or more processors are configured to execute the computer readable instructions to obtain an aerial image of the field and determine field metrics from the aerial image, the field metrics including at least one of an area of the field, a total throughput of the field, and a number of turns in the field; and wherein the one or more processors are configured to execute the computer readable instructions to determine, using an offline model calculator, the first amount of fuel required without halt and the first fuel consumption rate for the machine before the harvesting event based on historic field data and the field metrics determined based on the aerial image of the field. determine a current amount of fuel required without halt and a current fuel consumption rate for a machine during a harvesting event in a field based on a first amount of fuel required without halt, a first fuel consumption rate, and real time information from sensors of the machine; and determine a real time amount of fuel required based on the current amount of fuel required without halt, the current fuel consumption rate, and a halt time for the machine during the harvesting event, the one or more processors to use the real time amount of fuel required to schedule fuel delivery for the machine; wherein the one or more processors are configured to execute the computer readable instructions to obtain an aerial image of the field and determine field metrics from the aerial image, the field metrics including at least one of an area of the field, a total throughput of the field, and a number of turns in the field; and wherein the one or more processors are configured to execute the computer readable instructions to determine, using an offline model calculator, the first amount of fuel required without halt and the first fuel consumption rate for the machine before the harvesting event based on historic field data and the field metrics determined based on the aerial image of the field.