P.s just worked it out from Manchester to Scotland (Elgin) on a full tank i can do 480miles and its only 396 miles so thats good and thats with 40mpg if i hav e worked it out correctly
Your GPS will take you on the A9 as its the most direct route, if you want to go the scenic A82 which takes you through Glen Coe and past Loch Ness add "Fort William" as a detor.