diff --git a/API Server/internal/models/models.go b/API Server/internal/models/models.go
index 00b7b02..e9c8eb2 100644
--- a/API Server/internal/models/models.go	
+++ b/API Server/internal/models/models.go	
@@ -54,7 +54,7 @@ type Car struct {
 	BrakeFluidSpec      string `json:"brakeFluidSpec"`      // e.g. "DOT 4"
 	CoolantSpec         string `json:"coolantSpec"`         // e.g. "Toyota Super Long Life Coolant"
 
-	FuelType              string `json:"fuelType"`              // petrol | diesel | hybrid | electric
+	FuelType              string `json:"fuelType"`              // petrol | petrol_lpg | diesel | diesel_lpg | hybrid | electric | hydrogen
 	BuildDate             string `json:"buildDate"`             // ISO YYYY-MM-DD (date-only)
 	FirstRegistrationDate string `json:"firstRegistrationDate"` // ISO YYYY-MM-DD (date-only)
 
diff --git a/API Server/scripts/setup-pocketbase.mjs b/API Server/scripts/setup-pocketbase.mjs
index 791049a..c3b212a 100644
--- a/API Server/scripts/setup-pocketbase.mjs	
+++ b/API Server/scripts/setup-pocketbase.mjs	
@@ -245,7 +245,17 @@ const DESIRED = {
     F.text("brake_fluid_spec"),
     F.text("coolant_spec"),
     F.number("current_km"),
-    F.select("fuel_type", ["petrol", "diesel", "hybrid", "electric"]),
+    // Bi-fuel LPG conversions are their own choice rather than a flag: the car
+    // runs on either tank, so "petrol + LPG" is what an owner picks it out as.
+    F.select("fuel_type", [
+      "petrol",
+      "petrol_lpg",
+      "diesel",
+      "diesel_lpg",
+      "hybrid",
+      "electric",
+      "hydrogen",
+    ]),
     F.text("build_date"), // ISO YYYY-MM-DD (date-only; VIN 10th digit ≈ model year)
     F.text("first_registration_date"), // ISO YYYY-MM-DD
     // Owner of this car. Non-cascading on purpose: deleting a user must not
diff --git a/Phone App/lib/models.dart b/Phone App/lib/models.dart
index 5738f41..165ae17 100644
--- a/Phone App/lib/models.dart	
+++ b/Phone App/lib/models.dart	
@@ -18,7 +18,7 @@ class Car {
   final String differentialOilSpec;
   final String brakeFluidSpec;
   final String coolantSpec;
-  final String fuelType; // petrol | diesel | hybrid | electric
+  final String fuelType; // petrol | petrol_lpg | diesel | diesel_lpg | hybrid | electric | hydrogen
   final String buildDate; // ISO YYYY-MM-DD (date-only)
   final String firstRegistrationDate; // ISO YYYY-MM-DD (date-only)
   final int serviceIntervalDays;
diff --git a/Phone App/lib/screens/car_detail_screen.dart b/Phone App/lib/screens/car_detail_screen.dart
index 93f3068..84c355c 100644
--- a/Phone App/lib/screens/car_detail_screen.dart	
+++ b/Phone App/lib/screens/car_detail_screen.dart	
@@ -456,9 +456,12 @@ class _InfoTab extends StatelessWidget {
 
   static const Map<String, String> _fuelLabels = {
     "petrol": "Petrol (gasoline)",
+    "petrol_lpg": "Petrol (gasoline) + LPG",
     "diesel": "Diesel",
+    "diesel_lpg": "Diesel + LPG",
     "hybrid": "Hybrid",
     "electric": "Electric",
+    "hydrogen": "Hydrogen",
   };
   static String _fuelLabel(String v) => _fuelLabels[v] ?? "—";
 
diff --git a/Phone App/lib/screens/car_form_sheet.dart b/Phone App/lib/screens/car_form_sheet.dart
index 19d4041..7058855 100644
--- a/Phone App/lib/screens/car_form_sheet.dart	
+++ b/Phone App/lib/screens/car_form_sheet.dart	
@@ -198,9 +198,12 @@ class _CarFormSheetState extends State<CarFormSheet> {
                     labelText: "Fuel type", border: OutlineInputBorder(), isDense: true),
                 items: const [
                   DropdownMenuItem(value: "petrol", child: Text("Petrol (gasoline)")),
+                  DropdownMenuItem(value: "petrol_lpg", child: Text("Petrol (gasoline) + LPG")),
                   DropdownMenuItem(value: "diesel", child: Text("Diesel")),
+                  DropdownMenuItem(value: "diesel_lpg", child: Text("Diesel + LPG")),
                   DropdownMenuItem(value: "hybrid", child: Text("Hybrid")),
                   DropdownMenuItem(value: "electric", child: Text("Electric")),
+                  DropdownMenuItem(value: "hydrogen", child: Text("Hydrogen")),
                 ],
                 onChanged: (v) => setState(() => _fuelType = v ?? ""),
               ),
diff --git a/Web App/web/src/components/CarFormModal.vue b/Web App/web/src/components/CarFormModal.vue
index 229016c..c34b40c 100644
--- a/Web App/web/src/components/CarFormModal.vue	
+++ b/Web App/web/src/components/CarFormModal.vue	
@@ -110,9 +110,12 @@ async function submit() {
           <select v-model="form.fuelType" class="dh-input">
             <option value="">—</option>
             <option value="petrol">Petrol (gasoline)</option>
+            <option value="petrol_lpg">Petrol (gasoline) + LPG</option>
             <option value="diesel">Diesel</option>
+            <option value="diesel_lpg">Diesel + LPG</option>
             <option value="hybrid">Hybrid</option>
             <option value="electric">Electric</option>
+            <option value="hydrogen">Hydrogen</option>
           </select>
         </div>
         <div>
diff --git a/Web App/web/src/views/CarDetail.vue b/Web App/web/src/views/CarDetail.vue
index 1e9f9fa..da2a304 100644
--- a/Web App/web/src/views/CarDetail.vue	
+++ b/Web App/web/src/views/CarDetail.vue	
@@ -390,9 +390,12 @@ function yn(v) {
 
 const FUEL_LABELS = {
   petrol: "Petrol (gasoline)",
+  petrol_lpg: "Petrol (gasoline) + LPG",
   diesel: "Diesel",
+  diesel_lpg: "Diesel + LPG",
   hybrid: "Hybrid",
   electric: "Electric",
+  hydrogen: "Hydrogen",
 };
 function fuelLabel(v) {
   return FUEL_LABELS[v] || "—";