We've just done Edinburgh and back, I've kept all the receipts and mileages, up the A1 the long way round, back down the M6.
Quicker by the A1, 6.5 hours, coming back at higher speeds it was 7.25 hours.
I'll sit down and work out the figures, we had 18 miles on petrol as the Jet garage up near Morpeth was out of gas, but we found a place well up the road that had LPG so filled up there.
We were 2-up, with overnight luggage, had a project meeting in Edinburgh and trains/flying was just too much hassle.
Peter