Time for change, MPG help please

My Mk6.5 Zetec S Fiesta (1.6 TDCI) averages 57 mpg driven faster than normal i suppose you could say.

I've seen 80mpg over 20 miles on a proper granny run.
 
I can only dream of that sort of economy in my 1.6 Focus. Long term trip shows about 26mpg. I can get 45mpg if I sit at 60 on a motorway, but every 5mph increase drops economy massively.

Luckily I don't do many miles!
 
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