Car is indeed a Focus ST, as a member of a owners club, for a standard car with no modifications the mpg seems low, couple other chaps that do shorter journeys than myself get mid 20's.
I don't hoon it everywhere i go, i occasionally enjoy a quick blast but that's usually over in a matter of seconds because i'll be speeding if i don't back off!
If i can find an ST specialist local to me I will take it there asap as something isn't right, i get ~28mpg on long motorway trips (paignton to devizes ~140 miles each way)
Looking at other ST's i should be approacing 35mpg on motorway and ~23-25mpg around town.