Last tanks..
Fiesta van - 55mpg (mostly 25 mile B road journey, and general town driving)
Fiat Coupe - 26mpg (2 Pistonheads runs (dartmoor + a tunnel run), rest motorway at various speeds..
Thats actually the best over a tank I've had in the Fiesta (usually ~48-50) but the best in the Coupe is 37mpg, which was mostly motorway. Average in Coupe in 4 months ownership, about 25mpg I guess..