Yikes!
I have to admit I don't keep too close a check on my mpg (probably because I don't want to know the truth) but for the driving I do, mostly 10 miles each way to work and around Milton Keynes with all of its dual carriageways and roundabouts, I reckon on 20mpg. Keep remembering that the depreciation on a 20 year old V70 is negligible to non existent.