And one day when an old lady with rheumastism came to seed the Doctor, she sat on the hedgehog who was sleeping on the sofa and never came to see him any more, but drove every Saturday all the way to Osenthorpe, another town ten
miles off, to see a different doctor.
And my question, why in the text is used
miles off? Does it mean the same what
miles away? I mean if in this context
off means
away with the same meaning, if not what is difference?