I'm having a bit of trouble with my mpg at the moment, its getting me worried as its running at around 16mpg around town. I used to get around 19-21mpg. Now my driving isn't all slow and steady, but I'm not driving any different to they way I have been. Anyone else had this, or am I just being paranoid and thats usual for stop start traffic/ free flowing single/dual carriageway driving?

Its also using water at an alarming rate, which I hope I fixed today by replacing some knackered hoses. I'm fearing its the head gasket again, or even a cracked liner?