Add Fuel costs when they exist

templates/index.html

@@ -77,6 +77,7 @@ Last Mileage
     <th scope="col">Oil</th>
     <th scope="col">Litres</th>
     <th scope="col">$/Litre</th>
+    <th scope="col">$ Total</th>
   </tr>
 </thead>
 <tbody>
@@ -87,6 +88,9 @@ Last Mileage
     <td>{{ point['oilhealth'] }}</td>
     <td>{{ point['fuel'] }}</td>
     <td>{{ point['fuelcost'] }}</td>
+    {% if point['fuel'] %}
+    <td>{{ '%0.2f' % ((point['fuel'] | float) * (point['fuelcost'] | float)) }}</td>
+    {% endif %}
   </tr>
   {% endfor %}
 </tbody>