diff --git a/package-lock.json b/package-lock.json
index b443096..1652476 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "ln-bi",
-  "version": "1.1.22",
+  "version": "1.1.23",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "ln-bi",
-      "version": "1.1.22",
+      "version": "1.1.23",
       "dependencies": {
         "@amap/amap-jsapi-loader": "^1.0.1",
         "@hono/node-server": "^1.13.0",
diff --git a/package.json b/package.json
index 5cfd399..269359b 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "ln-bi",
   "private": true,
-  "version": "1.1.22",
+  "version": "1.1.23",
   "type": "module",
   "scripts": {
     "dev": "concurrently -n server,client -c blue,green \"npm run dev:server\" \"npm run dev:client\"",
diff --git a/src/modules/mileage/MonitoringView.tsx b/src/modules/mileage/MonitoringView.tsx
index 9ec2574..2c35af4 100644
--- a/src/modules/mileage/MonitoringView.tsx
+++ b/src/modules/mileage/MonitoringView.tsx
@@ -391,7 +391,6 @@ export default function MonitoringView() {
             rangeEnd={rangeEnd}
             onRangeStartChange={setRangeStart}
             onRangeEndChange={setRangeEnd}
-            onApplyRangePreset={applyRangePreset}
             departments={departments}
             filterDept={filterDept}
             onFilterDeptChange={setFilterDept}
diff --git a/src/modules/mileage/monitoring/components/FilterPanel.tsx b/src/modules/mileage/monitoring/components/FilterPanel.tsx
index faf840e..b2acc98 100644
--- a/src/modules/mileage/monitoring/components/FilterPanel.tsx
+++ b/src/modules/mileage/monitoring/components/FilterPanel.tsx
@@ -1,7 +1,8 @@
 import type { Dispatch, SetStateAction } from 'react';
 import { motion } from 'motion/react';
 import type { MonitoringFilters } from '../../types';
-import { defaultMileageDate, type RangePreset } from '../date-range';
+import { DateRangePicker } from '../../../../components/ui/DateRangePicker';
+import { defaultMileageDate, getRangePreset, type RangePreset } from '../date-range';
 import BatchMultiSelect from './BatchMultiSelect';
 import SearchableSelect from './SearchableSelect';
 
@@ -12,7 +13,6 @@ export default function FilterPanel({
   rangeEnd,
   onRangeStartChange,
   onRangeEndChange,
-  onApplyRangePreset,
   departments,
   filterDept,
   onFilterDeptChange,
@@ -42,7 +42,6 @@ export default function FilterPanel({
   rangeEnd: string;
   onRangeStartChange: (value: string) => void;
   onRangeEndChange: (value: string) => void;
-  onApplyRangePreset: (preset: RangePreset) => void;
   departments: string[];
   filterDept: string;
   onFilterDeptChange: (value: string) => void;
@@ -76,47 +75,25 @@ export default function FilterPanel({
       className="overflow-hidden"
     >
       <div className="bg-white p-4 rounded-2xl border border-gray-100 shadow-sm mb-2 space-y-4">
-        {/* Date range */}
-        <div className="space-y-1.5">
-          <label className="text-[10px] font-bold text-slate-400 uppercase tracking-wider">查询时间区间</label>
-          <div className="grid grid-cols-[1fr_auto_1fr] items-center gap-2">
-            <input
-              type="date"
-              aria-label="开始日期"
-              className="w-full bg-slate-50 border-none rounded-xl py-2 px-3 text-xs focus:ring-2 focus:ring-blue-500/20 outline-none"
-              value={rangeStart}
-              onChange={(e) => onRangeStartChange(e.target.value)}
-            />
-            <span className="text-[10px] font-bold text-slate-300">至</span>
-            <input
-              type="date"
-              aria-label="结束日期"
-              className="w-full bg-slate-50 border-none rounded-xl py-2 px-3 text-xs focus:ring-2 focus:ring-blue-500/20 outline-none"
-              value={rangeEnd}
-              onChange={(e) => onRangeEndChange(e.target.value)}
-            />
-          </div>
-          {rangeStart && rangeEnd && rangeStart > rangeEnd && <p role="alert" className="text-xs text-red-600">开始日期不能晚于结束日期</p>}
-          <div className="flex items-center gap-1.5 pt-1">
-            {([
-              ['today', '今天'],
-              ['yesterday', '昨天'],
-              ['thisWeek', '本周'],
-              ['thisMonth', '本月'],
-              ['last7', '近7天'],
-              ['last15', '近15天'],
-            ] as Array<[RangePreset, string]>).map(([preset, label]) => (
-              <button
-                key={preset}
-                type="button"
-                className="rounded-lg bg-slate-50 px-2 py-1 text-[10px] font-bold text-slate-500 hover:bg-blue-50 hover:text-blue-600"
-                onClick={() => onApplyRangePreset(preset)}
-              >
-                {label}
-              </button>
-            ))}
-          </div>
-        </div>
+        <DateRangePicker
+          label="查询时间区间"
+          value={{ start: rangeStart, end: rangeEnd }}
+          onChange={({ start, end }) => {
+            onRangeStartChange(start);
+            onRangeEndChange(end);
+          }}
+          quickPicks={([
+            ['today', '今天'],
+            ['yesterday', '昨天'],
+            ['thisWeek', '本周'],
+            ['thisMonth', '本月'],
+            ['last7', '近7天'],
+            ['last15', '近15天'],
+          ] satisfies Array<[RangePreset, string]>).map(([preset, label]) => ({
+            label,
+            range: getRangePreset(preset),
+          }))}
+        />
 
         <div className="grid grid-cols-2 gap-3">
           {/* Department */}
diff --git a/src/modules/mileage/monitoring/components/FullscreenMonitoring.tsx b/src/modules/mileage/monitoring/components/FullscreenMonitoring.tsx
index 99b0454..bdc749c 100644
--- a/src/modules/mileage/monitoring/components/FullscreenMonitoring.tsx
+++ b/src/modules/mileage/monitoring/components/FullscreenMonitoring.tsx
@@ -331,7 +331,8 @@ export default function FullscreenMonitoring({
                   </td>
                   <td className="px-3 py-2 text-right">
                     <span className={`text-xs font-mono font-bold ${v.isDataSynced ? 'text-slate-300' : 'text-slate-600'}`}>
-                      {v.totalKm != null ? <>{v.totalKm.toLocaleString()} <span className="text-[8px] text-slate-500">km</span></> : <span className="text-[8px] text-amber-500/50">未对接</span>}
+                      {v.totalKm != null ? <>{v.totalKm.toLocaleString()} <span className="text-[8px] text-slate-500">km</span></> : <span className="text-[8px] text-amber-500/50">暂无读数</span>}
+                      {v.totalKmFallbackDate && <span className="block text-[10px] text-slate-400">截至 {v.totalKmFallbackDate}</span>}
                     </span>
                   </td>
                 </tr>
diff --git a/src/modules/mileage/monitoring/components/VehicleList.tsx b/src/modules/mileage/monitoring/components/VehicleList.tsx
index b983eef..b88b83a 100644
--- a/src/modules/mileage/monitoring/components/VehicleList.tsx
+++ b/src/modules/mileage/monitoring/components/VehicleList.tsx
@@ -113,7 +113,8 @@ export default function VehicleList({
             <div className="hidden text-right md:block">
               <div className="text-xs font-black tabular-nums text-slate-700">
                 {v.totalKm != null ? v.totalKm.toLocaleString() : '-'}
-                <span className="ml-1 text-[9px] font-bold text-slate-400">km</span>
+                {v.totalKm != null && <span className="ml-1 text-[9px] font-bold text-slate-400">km</span>}
+                {v.totalKmFallbackDate && <div className="text-[10px] font-normal text-slate-500">截至 {v.totalKmFallbackDate}</div>}
               </div>
             </div>
             <div className="flex flex-shrink-0 flex-col items-end text-right md:hidden">
@@ -129,7 +130,8 @@ export default function VehicleList({
               <div className="flex items-center gap-1">
                 <span className="text-[7px] font-black text-slate-400/60 bg-slate-100 w-3 h-3 rounded flex items-center justify-center leading-none">总</span>
                 <span className="text-[8px] font-bold text-slate-300">
-                  {v.totalKm != null ? `${v.totalKm.toLocaleString()} km` : '未对接'}
+                  {v.totalKm != null ? `${v.totalKm.toLocaleString()} km` : '暂无读数'}
+                  {v.totalKmFallbackDate && <span className="block">截至 {v.totalKmFallbackDate}</span>}
                 </span>
               </div>
             </div>
diff --git a/src/modules/mileage/types.ts b/src/modules/mileage/types.ts
index 135af6c..4ee6733 100644
--- a/src/modules/mileage/types.ts
+++ b/src/modules/mileage/types.ts
@@ -16,6 +16,7 @@ export interface MonitoringVehicle {
   mileageAnomaly?: string | null;
   dailyMileage?: Record<string, number | null>;
   totalKm: number | null;
+  totalKmFallbackDate?: string;
   source: string;
   sourceProtocol: MileageSourceProtocol | null;
   sourceCategory: MileageSourceCategory | null;
diff --git a/src/modules/mileage/xlsx-export.ts b/src/modules/mileage/xlsx-export.ts
index 1d1ebda..dd37714 100644
--- a/src/modules/mileage/xlsx-export.ts
+++ b/src/modules/mileage/xlsx-export.ts
@@ -50,6 +50,7 @@ export function exportMileageXlsx(vehicles: MonitoringVehicle[], ctx: ExportCont
     ...(dayKeys.length > 0 ? dailyHeaders : []),
     isRange ? '区间合计(km)' : '当日里程(km)',
     '累计里程(km)',
+    ...(isRange ? ['累计读数日期'] : []),
   ];
 
   const summaryData: (string | number)[][] = [
@@ -71,6 +72,7 @@ export function exportMileageXlsx(vehicles: MonitoringVehicle[], ctx: ExportCont
         ...dailyCols,
         mileageCell(v, 'today'),
         mileageCell(v, 'total'),
+        ...(isRange ? [v.totalKm != null ? v.totalKmFallbackDate || end : ''] : []),
       ];
     }),
   ];
@@ -92,6 +94,7 @@ export function exportMileageXlsx(vehicles: MonitoringVehicle[], ctx: ExportCont
   for (let i = 0; i < dayKeys.length; i++) wsCols.push({ wch: 12 });
   wsCols.push({ wch: 14 }); // 区间合计
   wsCols.push({ wch: 14 }); // 累计里程
+  if (isRange) wsCols.push({ wch: 16 });
   ws['!cols'] = wsCols;
 
   // 冻结首行 + 固定列
@@ -126,6 +129,7 @@ export function exportMileageXlsx(vehicles: MonitoringVehicle[], ctx: ExportCont
       ...dayKeys.map(day => `${day}里程(km)`),
       '区间合计(km)',
       '累计里程(km)',
+      ...(isRange ? ['累计读数日期'] : []),
     ];
     const detailData: (string | number)[][] = [
       detailHeaders,
@@ -140,6 +144,7 @@ export function exportMileageXlsx(vehicles: MonitoringVehicle[], ctx: ExportCont
         ...dayKeys.map(day => v.dailyMileage?.[day] ?? '—'),
         mileageCell(v, 'today'),
         v.totalKm != null ? v.totalKm : '',
+        ...(isRange ? [v.totalKm != null ? v.totalKmFallbackDate || end : ''] : []),
       ]),
     ];
     const detailWs = XLSX.utils.aoa_to_sheet(detailData);
@@ -154,6 +159,7 @@ export function exportMileageXlsx(vehicles: MonitoringVehicle[], ctx: ExportCont
       ...dayKeys.map(() => ({ wch: 14 })),
       { wch: 14 },
       { wch: 14 },
+      ...(isRange ? [{ wch: 16 }] : []),
     ];
     detailWs['!freeze'] = { xSplit: 7, ySplit: 1 } as never;
     for (let r = 1; r < detailData.length; r++) {
diff --git a/src/server/routes/mileage/cache.ts b/src/server/routes/mileage/cache.ts
index b8a9d34..40137c1 100644
--- a/src/server/routes/mileage/cache.ts
+++ b/src/server/routes/mileage/cache.ts
@@ -127,7 +127,7 @@ export async function queryRangeMileage(
   ]);
   const { summary, yesterdayRows } = cached.result;
   return {
-    vehicles: buildSummaryMileage(summary, yesterdayRows, infoMap, targetRows, regionMap),
+    vehicles: buildSummaryMileage(summary, yesterdayRows, infoMap, targetRows, regionMap, cached.result.priorOdometers),
     summary,
     start: startDate, end: endDate,
     queriedAt: cached.queriedAt,
diff --git a/src/server/routes/mileage/monitoring-cache.test.ts b/src/server/routes/mileage/monitoring-cache.test.ts
index cb9f363..5628a71 100644
--- a/src/server/routes/mileage/monitoring-cache.test.ts
+++ b/src/server/routes/mileage/monitoring-cache.test.ts
@@ -54,11 +54,14 @@ test('summary integration preserves scope, valid partial mileage, trend nulls, r
   assert.equal(first.vehicles[0].plate,'TEST1');assert.equal(first.stats.totalToday,50);
   assert.equal(first.rangeDailyTotals?.[1].totalKm,null);
   assert.equal(requests.filter(r=>r.url.endsWith('/summary/query')).length,1);
-  assert.equal(requests.filter(r=>r.url.endsWith('/range/query')).length,0);
+  assert.deepEqual(requests.filter(r=>r.url.endsWith('/range/query')).map(r=>r.body.plateNumbers), [['TEST0']]);
   const second=await read('&page=2&limit=1&includeDailyTrend=0');assert.equal(second.vehicles[0].periodMileageKm,20);
   const sorted=await read('&sortOrder=asc&includeDailyTrend=0');assert.equal(sorted.vehicles[0].periodMileageKm,0);
   const exported=await read('&limit=9999&includeDailyTrend=0');
   assert.equal(exported.vehicles.length,4);assert.equal(exported.vehicles[3].periodMileageKm,null);
+  const fallback = exported.vehicles.find(v => v.plate === 'TEST0')!;
+  assert.equal(fallback.totalKm,100);
+  assert.equal(fallback.totalKmFallbackDate,'2026-10-10');
   assert.equal(exported.queriedAt,first.queriedAt);assert.ok(!exported.vehicles[0].dailyMileage);
   assert.equal(requests.filter(r=>r.url.endsWith('/summary/query')).length,1);
   user={...user,permissionLevel:'department'};
diff --git a/src/server/routes/mileage/query-cache.ts b/src/server/routes/mileage/query-cache.ts
index 2ad6413..f963ae8 100644
--- a/src/server/routes/mileage/query-cache.ts
+++ b/src/server/routes/mileage/query-cache.ts
@@ -1,5 +1,5 @@
-import { fetchOneOsDailyMileage, type OneOsDailyMileage } from './oneos-api.js';
-import { previousMileageDate } from './cache-model.js';
+import { fetchOneOsDailyMileage, fetchOneOsMileageDates, type OneOsDailyMileage } from './oneos-api.js';
+import { mileageDatesBetween, previousMileageDate } from './cache-model.js';
 import { fetchMileageSummary, type MileageSummary } from './summary-api.js';
 import type { OneOsProtocol } from './source-policy.js';
 
@@ -10,6 +10,7 @@ const MAX_ENTRIES = 4;
 export interface RangeMileageSource {
   summary: MileageSummary;
   yesterdayRows: OneOsDailyMileage[];
+  priorOdometers?: Map<string, { date: string; km: number }>;
 }
 
 type Entry = { result: RangeMileageSource; queriedAt: string; expiresAt: number };
@@ -19,7 +20,23 @@ async function loadSource(start: string, end: string, protocols: OneOsProtocol[]
     fetchMileageSummary(start, end, protocols, plates),
     plates ? Promise.resolve([]) : fetchOneOsDailyMileage(previousMileageDate(start), undefined, protocols, refresh),
   ]);
-  return { summary, yesterdayRows };
+  // Plate-scoped summary requests are used only for filtered trends.
+  if (plates || start === end) return { summary, yesterdayRows };
+  const missing = summary.vehicles.filter(v => v.endDateTotalMileageKm === null && v.validDays + v.anomalyDays > 0);
+  if (!missing.length) return { summary, yesterdayRows };
+  const dates = mileageDatesBetween(start, previousMileageDate(end));
+  const history = await fetchOneOsMileageDates(dates, missing.map(v => v.plateNumber), protocols);
+  const priorOdometers = new Map<string, { date: string; km: number }>();
+  for (const date of dates.reverse()) {
+    for (const row of history.get(date) || []) {
+      const plate = row.plateNumber.toUpperCase();
+      const trusted = row.status === 'NORMAL' || row.dataQuality === 'BASELINE_MISSING' || row.dataQuality === 'ODOMETER_SOURCE_CHANGED';
+      if (!priorOdometers.has(plate) && trusted && row.dataQuality !== 'CARRIED_FORWARD' && row.totalMileageKm != null) {
+        priorOdometers.set(plate, { date, km: row.totalMileageKm });
+      }
+    }
+  }
+  return { summary, yesterdayRows, priorOdometers };
 }
 
 export function createMonitoringQueryCache(
diff --git a/src/server/routes/mileage/summary-model.ts b/src/server/routes/mileage/summary-model.ts
index e26529b..b7312a8 100644
--- a/src/server/routes/mileage/summary-model.ts
+++ b/src/server/routes/mileage/summary-model.ts
@@ -4,15 +4,17 @@ import { buildPlateTargetNamesMap, dailyMileageMap, mergeMonitoringVehicles, typ
 import type { CachedVehicle, VehicleInfoRow } from './types.js';
 import { sourceCategoryFromProtocol } from './source-policy.js';
 
-export function buildSummaryMileage(summary: MileageSummary, yesterdayRows: OneOsDailyMileage[], infoMap: Map<string, VehicleInfoRow>, targets: TargetRow[], regions: Record<string, string>): CachedVehicle[] {
+export function buildSummaryMileage(summary: MileageSummary, yesterdayRows: OneOsDailyMileage[], infoMap: Map<string, VehicleInfoRow>, targets: TargetRow[], regions: Record<string, string>, priorOdometers?: Map<string, { date: string; km: number }>): CachedVehicle[] {
   const byPlate = new Map(summary.vehicles.map(v => [v.plateNumber, v]));
   return mergeMonitoringVehicles([], infoMap, dailyMileageMap(yesterdayRows), buildPlateTargetNamesMap(targets), regions).map(vehicle => {
     const row = byPlate.get(vehicle.plate.trim().toUpperCase());
     if (!row) return { ...vehicle, periodMileageKm: null };
+    const prior = priorOdometers?.get(row.plateNumber);
     const categories = new Set(row.sourceProtocols.map(sourceCategoryFromProtocol));
     return { ...vehicle, vin: row.vin || vehicle.vin,
       dailyKm: row.periodMileageKm ?? 0, periodMileageKm: row.periodMileageKm,
-      totalKm: row.endDateTotalMileageKm,
+      totalKm: row.endDateTotalMileageKm ?? prior?.km ?? null,
+      totalKmFallbackDate: prior?.date,
       validDays: row.validDays, missingDays: row.missingDays, anomalyDays: row.anomalyDays,
       qualityStatus: row.status, qualityReasons: row.qualityReasons, sourceProtocols: row.sourceProtocols,
       mileageAnomaly: row.anomalyDays ? row.qualityReasons.join(', ') || 'DATA_ANOMALY' : null,
diff --git a/src/server/routes/mileage/types.ts b/src/server/routes/mileage/types.ts
index d4421b6..1223304 100644
--- a/src/server/routes/mileage/types.ts
+++ b/src/server/routes/mileage/types.ts
@@ -13,6 +13,7 @@ export interface CachedVehicle {
   mileageAnomaly?: string | null;
   dailyMileage?: Record<string, number | null>;
   totalKm: number | null;
+  totalKmFallbackDate?: string;
   source: string;
   sourceProtocol: 'GB32960' | 'MQTT' | 'JT808' | null;
   sourceCategory: 'INSTRUMENT' | 'GPS' | 'MIXED' | null;