The fuel system takes its fuel from the bottom of the tank anyways people. Id be more worried about the possibility of water from the top of the fuel getting to the bottom. And thats not likely.

Anyways, your fuel economy is horrible.
Can people stop being retarted when talking about fuel economy please. Its not that ****ing hard to reset your trip meter, drive, fill up and note how many litres and just work out how many litres you get per hundred k's.

(litres)/(how many hundreds of kays)

So 50 Litres in 500 kms is 50/5 = 10L/100kms
50 litres and 5 hundred kms.

I have an average of 8.5L/100kms in my manual BB6. And thats with only suburban and peak hour traffic in Adelaide.