I used to do the whole MPG debacle but got bored after a while, I'd get 47 - 48mpg in my 1.4 on motorways and 44 - 45 in town. When I established that I'd only see significant savings if I drove like that for a year I gave up because it made for quite a boring drive, I average 44 on motorways now and 39 - 40 in town.