Please note that my 73mpg run was
waaaaay exceptional!
It took a huge amount of concentration and self control, and was helped by drafting every available lorry going
In normal use I am getting more like 42-44 mpg
Not as great as some, and nothing like as great as it could be if I showed a little but more restraint
But compared to the 28mpg I was getting from my TT, I'm still quids in, so I'm happy