A whole lot of stuff

lib/screens/ui_settings_screen.dart

@@ -40,6 +40,30 @@ class UiSettingsScreen extends StatelessWidget {
               ),
             ),
           ),
+          const SizedBox(height: 16),
+          Card(
+            child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  SwitchListTile(
+                    contentPadding: EdgeInsets.zero,
+                    title: const Text('Estimated Fuel Refund'),
+                    subtitle: const Text(
+                      'Shows an estimate of your Missouri Highway Fuel Tax Refund next to '
+                      'your receipts and totals. Based on the current rate — contingent on '
+                      "it, and not a substitute for confirming the actual amount with the "
+                      'Missouri Department of Revenue.',
+                    ),
+                    value: appState.showEstimatedFuelRefund,
+                    onChanged: (value) =>
+                        context.read<AppState>().setShowEstimatedFuelRefund(value),
+                  ),
+                ],
+              ),
+            ),
+          ),
         ],
       ),
     );