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5F66: Fuel level (0-255). $FF=full tank, $00=empty.
Mechanic Rate Formula
Consumption 1 unit every 2 frames ~25 units/sec at 50fps
Refueling 4 units per frame ~200 units/sec at 50fps
Full tank duration ~10 seconds 255 / 25 = 10.2 sec
Full refuel time ~1.3 seconds 255 / 200 = 1.3 sec
Consumption rate does NOT depend on scroll speed. Low fuel warning triggers when <$40 (top 2 bits clear). Refueling only occurs when plane is centered over depot (not banking left/right).
state_fuel 5F66 DEFB $00
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