I can get anything from about 25 - 35 (at a push) depending on the roads.
M'ways usually return about 30ish maybe a bit more at around 80mph
And depending on traffic (ie if there is some) I can get upto 32 in normal driving, if I get to play the roads on my own I can quite easily drop to about 25 or lower, depending on my mood.
I have found that the type of fuel I use makes a massive difference. Shell V-Power and BP Ultimate give me about 5mpg more than crappy normal unleaded rubbish.