Initially, you need to specify an amount in order that we can add your order to the total members' order to negotiate a good price. However, when you submit your order, there is a box marked "order comments", and this is here where you can request that the driver fills your tank.

Please be aware that there is no guarantee that they will be able to fill your tank, as it depends on similar demands from members who are before you on the list of deliveries for that day. They should however deliver the amount you request on your order.