Yeah! I've noticed a difference last few days, but then the car was serviced last Friday with air filter, oil etc so not sure if that's made the difference (even though I change air filter every 5k).
I don't remember the MPG being as bad when I bought the car last June, as it was over the winter, as im sure in the summer I used to get 32-35mpg on the drive to/from work (even saw 42mpg once in August driving home from a friends about 20 miles away) whereas in the Winter i'd never see 30mpg on that same journey (gentle driving too) So think the slightly warmer weather is definately making a big difference.