Just thought I would share my experience of topping up for the first time. Having done 6000 miles now, about to go abroad next month and no way of knowing if it was delivered with a full tank, best thought would play it safe. I have the 24 litre tank and having checked I could top it up at a nearby service station on the M5, Frankly north, did so on a way to a meeting last week. The cashier (Welsh Mark) was great, showed me a few options, 2 litre bottle ( can't remember the price), 10 litre bottle with filling attachment for £16.99 or the pump on the HGV island if the nozzle fitted at 89p a litre. Bit of a no brained to try the HGV pump first, the nozzle (bp) fits in and having had to go back to the shop to swipe the card for the pump first, topped up with 11 and a bit litres in no time. So based on that you use 1 litre about 550 miles. So should be ok now for another 12000 miles! Dead easy and mucho cheaper than the containers. Phil 190 tdi sline avant auto, moonlight blue, adaptive sports suspension, tech pack, 18" wheels, and a few other toys..