Good work Seabrook, I get similar on my mine on a long run, sometimes I`ve seen 44 mpg, but not often.
I had a look under my Mk6 yesterday as I have a noise when setting off.
It sounded like an exhaust bracket moving in the rubber hanger. I`ve wiggled and wiggled the exhaust but it`s not that.
Maybe an engine mount? I don`t know and I guess I`ll have to take it to the garage for further investigation.