The controller obtains engine rpm (R) of the tractor, throttle output value (X1) of the tractor, operational velocity (V) of the tractor, and working width (W) of the tractor from the speedometer, potentiometer, GPS sensor and input device, and calculates throttle engine rpm (R2), expected output (P3) of the tractor, fuel consumption (Q), working capacity (C), and expected fuel consumption (Q1) per unit area.
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