I can currently get 410 miles out of my tank before I fill up. I generally fill up just before the reserve light shows up, so i guess I have roughly 10ltr left.
Im currently working out how many MPG I get, because I know the 72mpg stated is a lie and must of been done in the vacuum of space using unicorn dust fuel. I am currently getting 62mpg brim-to-brim and 65/6 on the computer, but I have only just started this investigation this month.
There is a bigger thread talking about this, but as mentioned in it, it is all dependent on your driving style.
For the current average price of fuel (117.9p) to fill my tank up costs just under £45 using my conservative method of fueling.