my record is 36MPG.....i wanted to see what i could get so put all my best fuel saving tactics to use and never once let the turbo come on boost, kept a steady 65MPH. It was late one Sunday evening so no traffic.
I was driving back to Sheffield from Essex so the entire trip (bare about 10miles at each end) was dual carriage way or motorway which does help a lot. but it was rather
and not something i'm keen to repeat. Like the OP we also have a more sensible car for longer trips.
On the way down the day before I managed 23MPG for the exact same trip
