diff --git a/server/bridge.js b/server/bridge.js
index 81427a2..013454f 100644
--- a/server/bridge.js
+++ b/server/bridge.js
@@ -325,6 +325,7 @@ function startDemo() {
     // engine strip (arrays, like the sim)
     engRpm: [2410], fuelFlow: [0.0072], oilTemp: [88], oilPress: [52], egt: [720],
     fuelQty: [60, 58], volts: [process.env.DEMO_ALERT ? 23.4 : 28.0, 27.8], amps: [-1.5], genAmps: [20.5], engHrs: 5040,
+    fuelTot: 118 * 2.72, fuelMax: 144 * 2.72, // fuel totalizer: 118 of 144 gal (kg) — SYSTEM keys adjust
   });
   // a sample plan so the map/FMS show something in demo mode
   fp.setPlan({ name: 'DEMO', waypoints: [
diff --git a/server/config.js b/server/config.js
index 7917248..a08e566 100644
--- a/server/config.js
+++ b/server/config.js
@@ -96,6 +96,8 @@ export const DATAREFS = {
   oilPress:    'sim/cockpit2/engine/indicators/oil_pressure_psi',
   egt:         'sim/cockpit2/engine/indicators/EGT_deg_C',
   fuelQty:     'sim/cockpit2/fuel/fuel_quantity',
+  fuelTot:     'sim/cockpit2/fuel/fuel_totalizer_sum_kg', // pilot-set fuel totalizer (remaining, kg)
+  fuelMax:     'sim/aircraft/weight/acf_m_fuel_tot',      // max fuel capacity (kg) — for RST FUEL
   volts:       'sim/cockpit2/electrical/bus_volts',     // array: [0]=main bus, [1]=essential
   amps:        'sim/cockpit2/electrical/battery_amps',  // battery (S) amps
   genAmps:     'sim/cockpit2/electrical/generator_amps', // alternator (M) amps
@@ -135,6 +137,7 @@ export const WRITABLE_DATAREFS = {
   xpdrMode: 'sim/cockpit2/radios/actuators/transponder_mode', // 0 off,1 stby,2 on,3 alt
   xpdrCode: 'sim/cockpit2/radios/actuators/transponder_code', // 4-digit squawk
   cdiSrc:   'sim/cockpit2/radios/actuators/HSI_source_select_pilot', // 0 NAV1 · 1 NAV2 · 2 GPS (CDI softkey cycles it)
+  fuelTot:  'sim/cockpit2/fuel/fuel_totalizer_sum_kg', // SYSTEM → DEC/INC/RST FUEL adjusts the totalizer
 };
 
 // Commands the frontend may TRIGGER (autopilot mode buttons etc.).
diff --git a/server/navdata.js b/server/navdata.js
index 9f8ddaa..0c40d27 100644
--- a/server/navdata.js
+++ b/server/navdata.js
@@ -167,9 +167,13 @@ async function parseAirways(file) {
     const b = index.get((p[3] || '').toUpperCase());
     if (!a || !b) continue;                       // endpoint not in our database
     const name = p[p.length - 1];
+    // Field 8 (index 7) = airway layer: 1 = low/Victor, 2 = high/Jet (used by the
+    // MFD AIRWAYS key to show all / Victor-only / Jet-only). Fall back to the name
+    // prefix (V… = low, J… = high) if the field is missing.
+    const lyr = +p[7] === 1 ? 1 : +p[7] === 2 ? 2 : /^J/i.test(name) ? 2 : /^V/i.test(name) ? 1 : 0;
     const k = `${Math.floor((a.lat + b.lat) / 2)},${Math.floor((a.lon + b.lon) / 2)}`;
     let arr = awyCells.get(k); if (!arr) { arr = []; awyCells.set(k, arr); }
-    arr.push({ la1: a.lat, lo1: a.lon, la2: b.lat, lo2: b.lon, name });
+    arr.push({ la1: a.lat, lo1: a.lon, la2: b.lat, lo2: b.lon, name, lyr });
     state.awy++;
   }
 }
diff --git a/web/src/components/Bezel.jsx b/web/src/components/Bezel.jsx
index ad89dc4..6188a7a 100644
--- a/web/src/components/Bezel.jsx
+++ b/web/src/components/Bezel.jsx
@@ -28,10 +28,11 @@ const PFD_MENU = {
 // page; TOPO/TERRAIN/OSM switch the base map; BACK returns. (OSM is our tuned
 // extra layer in an otherwise-empty slot.)
 const MFD_MENU = {
-  root:   ['ENGINE', 'MAP', '', '', '', '', '', '', '', 'DCLTR', '', ''],
+  root:   ['SYSTEM', 'MAP', '', '', '', '', '', '', '', 'DCLTR', '', ''],
   mapopt: ['TRAFFIC', 'PROFILE', 'TOPO', 'TERRAIN', 'AIRWAYS', 'AIRSPACE', 'NEXRAD', 'OSM', '', '', 'BACK', ''],
-  engine: ['DEC FUEL', 'INC FUEL', 'RST FUEL', '', '', '', '', '', '', '', 'BACK', ''],
+  system: ['DEC FUEL', 'INC FUEL', 'RST FUEL', '', '', '', '', '', '', '', 'BACK', ''],
 };
+const KG_PER_GAL = 2.72; // fuel totalizer steps in US gallons (matches the EIS readout)
 
 // autopilot_state bitfield (best-effort; tweak per aircraft)
 const AP_BITS = { fd: 1 << 0, hdg: 1 << 1, vs: 1 << 4, flc: 1 << 6, nav: 1 << 8, apr: 1 << 9, vnav: 1 << 11, altHold: 1 << 14, bc: 1 << 18 };
@@ -67,13 +68,16 @@ export default function Bezel({ variant = 'pfd', xp, svt3d, onToggleSvt, inset,
     const cycleDcltr = (setter) => setter && setter((m) => ({ ...m, dcltr: (((m.dcltr || 0) + 1) % 4) }));
     if (variant === 'mfd') {
       if (label === 'MAP') setPage('mapopt');
-      else if (label === 'ENGINE') setPage('engine');
+      else if (label === 'SYSTEM') setPage('system');
       else if (label === 'BACK') setPage('root');
+      else if (label === 'DEC FUEL' && xp) xp.setDataref('fuelTot', Math.max(0, num(xp.values?.fuelTot) - KG_PER_GAL));
+      else if (label === 'INC FUEL' && xp) xp.setDataref('fuelTot', num(xp.values?.fuelTot) + KG_PER_GAL);
+      else if (label === 'RST FUEL' && xp) xp.setDataref('fuelTot', num(xp.values?.fuelMax) || num(xp.values?.fuelTot));
       else if (label === 'TOPO') setBase('topo');                                         // relief on/off
       else if (label === 'TERRAIN') onMapMode && onMapMode((m) => ({ ...m, terrain: !m.terrain })); // awareness overlay (independent)
       else if (label === 'OSM') setBase('osm');
       else if (label === 'DCLTR') cycleDcltr(onMapMode);
-      else if (label === 'AIRWAYS') onMapMode && onMapMode((m) => ({ ...m, airways: !m.airways }));
+      else if (label === 'AIRWAYS') onMapMode && onMapMode((m) => ({ ...m, airways: (((m.airways | 0) + 1) % 4) })); // off→all→Victor→Jet
       else if (label === 'AIRSPACE') onMapMode && onMapMode((m) => ({ ...m, airspace: !m.airspace }));
     } else {
       if (label === 'PFD') setPage('pfd');
@@ -149,7 +153,9 @@ export default function Bezel({ variant = 'pfd', xp, svt3d, onToggleSvt, inset,
           <div className="sk-labels">
             {keys.map((s, i) => (
               <span key={i} className={`skl ${s ? '' : 'empty'} ${s === 'CAUTION' ? 'caution' : ''} ${isOn(s) ? 'on' : ''}`}>{
-                (s === 'DCLTR' && (mapMode?.dcltr || insetMode?.dcltr)) ? `DCLTR-${mapMode?.dcltr || insetMode?.dcltr}` : s
+                (s === 'DCLTR' && (mapMode?.dcltr || insetMode?.dcltr)) ? `DCLTR-${mapMode?.dcltr || insetMode?.dcltr}`
+                  : (s === 'AIRWAYS' && (mapMode?.airways | 0) >= 2) ? (mapMode.airways === 2 ? 'AIRWY-LO' : 'AIRWY-HI')
+                  : s
               }</span>
             ))}
           </div>
diff --git a/web/src/components/FplPage.jsx b/web/src/components/FplPage.jsx
index 9b87c83..bbcd8b4 100644
--- a/web/src/components/FplPage.jsx
+++ b/web/src/components/FplPage.jsx
@@ -80,7 +80,11 @@ export default function FplPage({ xp, full = false, onClose }) {
         const vsReq = c > 0 ? (t - alt) / (c / gs * 60) : 0;
         const vDev = alt - (t + c * 6076.12 * tan);
         const todNm = c - (alt - t) / (6076.12 * tan);
-        vnav = { wptId: wps[i].id, tgtAlt: t, vsTgt, vsReq, vDev, fpa: 3.0, todSec: todNm > 0 ? (todNm / gs) * 3600 : 0 };
+        // Before TOD: time until the descent path is intercepted. After TOD (already
+        // descending): time to Bottom of Descent = reaching the target waypoint.
+        const todSec = todNm > 0 ? (todNm / gs) * 3600 : 0;
+        const bodSec = todNm > 0 ? 0 : (c / gs) * 3600;
+        vnav = { wptId: wps[i].id, tgtAlt: t, vsTgt, vsReq, vDev, fpa: 3.0, todSec, bodSec };
         break;
       }
     }
@@ -124,7 +128,10 @@ export default function FplPage({ xp, full = false, onClose }) {
             <div className="fpl-vnav-grid">
               <b>ACTIVE VNV WPT</b><span className="vwpt">{vnav.tgtAlt}<u>FT</u> at {vnav.wptId}</span>
               <b>VS TGT</b><span>{Math.round(vnav.vsTgt)}<u>FPM</u></span><b>FPA</b><span>{vnav.fpa.toFixed(1)}°</span>
-              <b>VS REQ</b><span>{Math.round(vnav.vsReq)}<u>FPM</u></span><b>TIME TO TOD</b><span>{fmtSec(vnav.todSec)}</span>
+              <b>VS REQ</b><span>{Math.round(vnav.vsReq)}<u>FPM</u></span>
+              {vnav.todSec > 0
+                ? <><b>TIME TO TOD</b><span>{fmtSec(vnav.todSec)}</span></>
+                : <><b>TIME TO BOD</b><span>{fmtSec(vnav.bodSec)}</span></>}
               <b>V DEV</b><span>{vnav.vDev >= 0 ? '+' : ''}{Math.round(vnav.vDev)}<u>FT</u></span>
             </div>
           ) : <div className="fpl-vnav-none">— no active VNAV profile —</div>}
diff --git a/web/src/components/MFD.jsx b/web/src/components/MFD.jsx
index 64ad036..bdcede4 100644
--- a/web/src/components/MFD.jsx
+++ b/web/src/components/MFD.jsx
@@ -155,6 +155,17 @@ function EisStrip({ V }) {
       <Bar y={284} label="VAC" min={0} max={10} value={5}
         zones={[{ from: 4.5, to: 5.5, c: '#0c0' }]} />
       <FuelBar y={330} left={fuelL} right={fuelR} />
+      {/* fuel totalizer (SYSTEM → DEC/INC/RST FUEL): pilot-set remaining + used */}
+      {(() => {
+        const rem = num(V.fuelTot) / KG_PER_GAL;
+        const used = Math.max(0, (num(V.fuelMax) - num(V.fuelTot)) / KG_PER_GAL);
+        return (<>
+          <text x="8" y="392" fill="#39d3c0" fontSize="11">CALC</text>
+          <text x="118" y="392" fill="#fff" fontSize="14" textAnchor="end">{rem.toFixed(1)}</text>
+          <text x="124" y="392" fill="#7f8c97" fontSize="10">GAL</text>
+          <text x="182" y="392" fill="#9aa" fontSize="10" textAnchor="end">USED {used.toFixed(0)}</text>
+        </>);
+      })()}
       <text x="8" y="412" fill="#39d3c0" fontSize="12">ENG</text>
       <text x="182" y="412" fill="#fff" fontSize="14" textAnchor="end">{engHrs.toFixed(1)} HRS</text>
       <text x="95" y="438" fill="#39d3c0" fontSize="12" textAnchor="middle">– ELECTRICAL –</text>
diff --git a/web/src/components/MapView.jsx b/web/src/components/MapView.jsx
index 94f62fe..957c820 100644
--- a/web/src/components/MapView.jsx
+++ b/web/src/components/MapView.jsx
@@ -100,7 +100,7 @@ export default function MapView({ values, flightPlan, fp, inset = false, hud = t
   const track = num(values.track);
   const gs = num(values.groundspeed) * 1.94384; // m/s -> kt
   const base = mapMode?.base || 'topo';
-  const airways = !!mapMode?.airways;
+  const airways = (mapMode?.airways | 0); // 0 off · 1 all · 2 Victor (low) · 3 Jet (high)
   const airspace = !!mapMode?.airspace;
   aspOnRef.current = airspace;
   const dcltrRef = useRef(dcltr);
@@ -154,8 +154,11 @@ export default function MapView({ values, flightPlan, fp, inset = false, hud = t
         const segs = await res.json();
         layer.clearLayers();
         const labels = map.getZoom() >= 8;
+        const mode = awyOnRef.current;                  // 1 all · 2 Victor (low) · 3 Jet (high)
         const seen = new Set();
         for (const sg of segs) {
+          if (mode === 2 && sg.lyr !== 1) continue;     // Victor-only: low-altitude airways
+          if (mode === 3 && sg.lyr !== 2) continue;     // Jet-only: high-altitude airways
           L.polyline([[sg.la1, sg.lo1], [sg.la2, sg.lo2]], { color: '#5db4e6', weight: 1.2, opacity: 0.7, interactive: false }).addTo(layer);
           if (labels && sg.name && !seen.has(sg.name)) {
             seen.add(sg.name);