Doing a check over this thread as I had just flew over it in past. Did I just read 1 1/2 miles, one and half miles driving with petrol in the diesel. Can't believe your contemplating doing an injector change. Think it was my son that did this years ago with his injection car and he drove it back home about 6 miles. Didn't hiccup or anything enroute he said. But its up to you of course, garage, AA and RAC would recommend you change them after half a mile.