diff --git a/modules/inbound/inbound-mqtt/src/main/java/com/lingniu/ingest/inbound/mqtt/mapper/YutongEventMapper.java b/modules/inbound/inbound-mqtt/src/main/java/com/lingniu/ingest/inbound/mqtt/mapper/YutongEventMapper.java
index e901ea38..93d001a3 100644
--- a/modules/inbound/inbound-mqtt/src/main/java/com/lingniu/ingest/inbound/mqtt/mapper/YutongEventMapper.java
+++ b/modules/inbound/inbound-mqtt/src/main/java/com/lingniu/ingest/inbound/mqtt/mapper/YutongEventMapper.java
@@ -16,6 +16,7 @@ import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Base64;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.UUID;
 
@@ -96,10 +97,13 @@ public final class YutongEventMapper implements EventMapper<MqttPayload> {
                     speed == null ? 0.0 : speed,
                     direction == null ? 0.0 : direction,
                     0, 0);
+            Map<String, String> locationMeta = mileage == null
+                    ? meta
+                    : withMeta(meta, "total_mileage_km", formatDouble(mileage));
             out.add(new VehicleEvent.Location(
                     UUID.randomUUID().toString(),
                     vin, ProtocolId.MQTT_YUTONG, payload.deviceTime(), ingestTime,
-                    null, meta, loc));
+                    null, locationMeta, loc));
         }
         return out;
     }
@@ -233,6 +237,13 @@ public final class YutongEventMapper implements EventMapper<MqttPayload> {
         }
     }
 
+    private static String formatDouble(double value) {
+        String formatted = String.format(Locale.ROOT, "%.6f", value);
+        return formatted.indexOf('.') < 0
+                ? formatted
+                : formatted.replaceAll("0+$", "").replaceAll("\\.$", "");
+    }
+
     private record IdentityResolution(VehicleIdentity identity, String errorMessage) {
         private static IdentityResolution ok(VehicleIdentity identity) {
             return new IdentityResolution(identity, null);
diff --git a/modules/inbound/inbound-mqtt/src/test/java/com/lingniu/ingest/inbound/mqtt/YutongEventMapperTest.java b/modules/inbound/inbound-mqtt/src/test/java/com/lingniu/ingest/inbound/mqtt/YutongEventMapperTest.java
index 3aec762e..a2aa3702 100644
--- a/modules/inbound/inbound-mqtt/src/test/java/com/lingniu/ingest/inbound/mqtt/YutongEventMapperTest.java
+++ b/modules/inbound/inbound-mqtt/src/test/java/com/lingniu/ingest/inbound/mqtt/YutongEventMapperTest.java
@@ -73,6 +73,7 @@ class YutongEventMapperTest {
         VehicleEvent.Location loc = (VehicleEvent.Location) events.stream()
                 .filter(e -> e instanceof VehicleEvent.Location).findFirst().orElseThrow();
         assertThat(loc.payload().longitude()).isEqualTo(116.397128, org.assertj.core.data.Offset.offset(0.000001));
+        assertThat(loc.metadata()).containsEntry("total_mileage_km", "123456.7");
     }
 
     @Test
diff --git a/modules/protocols/protocol-gb32960/src/main/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapper.java b/modules/protocols/protocol-gb32960/src/main/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapper.java
index a92b6f45..b2f5a864 100644
--- a/modules/protocols/protocol-gb32960/src/main/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapper.java
+++ b/modules/protocols/protocol-gb32960/src/main/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapper.java
@@ -16,6 +16,7 @@ import java.time.Instant;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
@@ -164,10 +165,13 @@ public final class Gb32960EventMapper implements EventMapper<Gb32960Message> {
                     p.longitude, p.latitude, 0.0,
                     v != null && v.speedKmh != null ? v.speedKmh : 0.0,
                     0.0, 0, p.statusFlag);
+            Map<String, String> locationMeta = v != null && v.totalMileageKm != null
+                    ? withMeta(meta, "total_mileage_km", formatDouble(v.totalMileageKm))
+                    : meta;
             out.add(new VehicleEvent.Location(
                     UUID.randomUUID().toString(),
                     header.vin(), ProtocolId.GB32960, eventTime, ingestTime,
-                    null, meta, loc));
+                    null, locationMeta, loc));
         }
         if (alarm != null && shouldEmitAlarm(alarm)) {
             // 只在存在告警等级或氢安全关键位时发 Alarm，减少正常高频帧对告警消费者的噪声。
@@ -330,4 +334,17 @@ public final class Gb32960EventMapper implements EventMapper<Gb32960Message> {
         if (codes == null || codes.isEmpty()) return;
         for (Long c : codes) out.add(prefix + "-" + Long.toHexString(c));
     }
+
+    private static Map<String, String> withMeta(Map<String, String> meta, String key, String value) {
+        java.util.HashMap<String, String> copy = new java.util.HashMap<>(meta);
+        copy.put(key, value == null ? "" : value);
+        return Map.copyOf(copy);
+    }
+
+    private static String formatDouble(double value) {
+        String formatted = String.format(Locale.ROOT, "%.6f", value);
+        return formatted.indexOf('.') < 0
+                ? formatted
+                : formatted.replaceAll("0+$", "").replaceAll("\\.$", "");
+    }
 }
diff --git a/modules/protocols/protocol-gb32960/src/test/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapperTest.java b/modules/protocols/protocol-gb32960/src/test/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapperTest.java
index 949e1b7b..8f4e1d15 100644
--- a/modules/protocols/protocol-gb32960/src/test/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapperTest.java
+++ b/modules/protocols/protocol-gb32960/src/test/java/com/lingniu/ingest/protocol/gb32960/mapper/Gb32960EventMapperTest.java
@@ -42,6 +42,12 @@ class Gb32960EventMapperTest {
         assertThat(events).anyMatch(e -> e instanceof VehicleEvent.Location);
         assertThat(events).allMatch(e -> e.source() == ProtocolId.GB32960);
         assertThat(events).allMatch(e -> e.vin().equals("LTEST000000000002"));
+        VehicleEvent.Location location = events.stream()
+                .filter(VehicleEvent.Location.class::isInstance)
+                .map(VehicleEvent.Location.class::cast)
+                .findFirst()
+                .orElseThrow();
+        assertThat(location.metadata()).containsEntry("total_mileage_km", "123456.7");
     }
 
     @Test