.

de_react_auto

@@ -58,6 +58,10 @@ local CONFIG = {
     min_saturation = 0.20,         -- Below this, reactor produces less power
     target_saturation = 0.45,      -- Target saturation for optimal output (lower = more power)
 
+    -- Fuel monitoring
+    fuel_warning_threshold = 0.85,   -- Warn when fuel is 90% used
+    fuel_shutdown_threshold = 0.90,  -- Auto-shutdown when fuel is 95% used
+
     -- Update intervals (in seconds)
     update_interval = 0.1,         -- Main loop speed (faster = more responsive)
     display_interval = 0.5,        -- Monitor refresh rate
@@ -111,6 +115,9 @@ local lastFluxUpdate = 0
 local lastInputRate = -1
 local lastOutputRate = -1
 
+-- Fuel warning throttle
+local lastFuelWarning = 0
+
 -- ============================================================================
 -- UTILITY FUNCTIONS
 -- ============================================================================
@@ -503,6 +510,26 @@ local function processStateMachine()
         end
     end
 
+    -- Check fuel level
+    local maxFuel = reactorInfo.maxFuelConversion or 1
+    if maxFuel <= 0 then maxFuel = 1 end
+    local fuelUsed = (reactorInfo.fuelConversion or 0) / maxFuel
+
+    if fuelUsed >= CONFIG.fuel_shutdown_threshold then
+        -- Fuel nearly depleted - initiate shutdown
+        if state ~= STATES.SHUTDOWN and state ~= STATES.EMERGENCY then
+            print("[FUEL] CRITICAL: Fuel " .. formatPercent(fuelUsed) .. " depleted! Initiating shutdown...")
+            shutdownRequested = true
+        end
+    elseif fuelUsed >= CONFIG.fuel_warning_threshold then
+        -- Fuel low - warn user (throttle to every 5 seconds)
+        local now = os.clock()
+        if now - lastFuelWarning >= 5 then
+            lastFuelWarning = now
+            print("[FUEL] WARNING: Fuel " .. formatPercent(fuelUsed) .. " used - running low!")
+        end
+    end
+
     -- Check for shutdown request
     if shutdownRequested then
         if reactorStatus == "cold" or reactorStatus == "cooling" then
@@ -869,11 +896,17 @@ local function updateDisplay()
         fieldColor = colors.red
     end
 
+    -- Show correct target based on state (55% during charging, 30% when running)
+    local fieldTarget = CONFIG.target_field_strength
+    if state == STATES.CHARGING or state == STATES.WARMING_UP then
+        fieldTarget = CONFIG.charge_field_target
+    end
+
     mon.setCursorPos(1, y)
     mon.setTextColor(colors.white)
     mon.write("Field Strength: ")
     mon.setTextColor(fieldColor)
-    mon.write(formatPercent(fieldPercent) .. " (Target: " .. formatPercent(CONFIG.target_field_strength) .. ")")
+    mon.write(formatPercent(fieldPercent) .. " (Target: " .. formatPercent(fieldTarget) .. ")")
     y = y + 1
 
     -- Field bar