It's so up and down with the temps at the moment, and my mpg is up and down like a yo-yo too:-
Yesterday morning commute to work (light traffic), -2C, 13 miles commute, 41.7mpg
Yesterday afternoon drive into Newcastle (moderate traffic), +14C, 8 miles, 45.7mpg
Yesterday night, drive home from Newcastle (very light traffic), +9C, 8 miles, 49.2mpg
This morning commute to work (light traffic), +3C, 13 miles commute, 41.9mpg
Last night's drive home was probably the least saintly, an Alfa Mito was hitching a lift (or so it seemed), until we passed the cameras on the Coast Road and it ate my dust as I left it far behind.