My best result yet. Can't believe a 20+ year old car just seems to be getting better with age, SDIs are like a fine wine 😆. Filled up after 580 miles and the fuel light hadn't even come on. It would have easily done 600+ on the tank taking it to the line. Maybe the warm temperatures are helping. Flatter terrain than my usual routes through the Scottish Highlands, but not totally devoid of some hills either.
I reckon 90mpg might actually be possible on a very flat route, perhaps with some weight shedding, I even had the windows down the whole journey...