Here are trip computer figures for my Jazz EX on its current continental road trip. Summer tyres, aircon on.
One shows it in mpg ,the other the same figures in litres per 100 km '
Prev 3' is A roads, no motorway , includes crossing the Brenner pass from Austria into Italy. For much of this trip the average was 88 mpg.
Prev 2' is A roadsc, crossing a mountain pass and approx 25% on motorway
Prev 1' is in A roads and about 70 % of it on motorway
Current is A roads. No motorway
Motorways were fairly leisurely - maybe 60 -65mph, but faster at times .
I am very pleased with these results. Average from new (5263 miles )is 67.9 mpg