Man City's Toure: Hart made difference
City went on to win the game thanks to fine goals from Yaya and Carlos Tevez.
Toure, whose side still trail Manchester United by 12 points, said: "The first half was quite good, we missed a couple of chances and Joe had to make a big save. I think it made the difference.
"Of course we know United are very strong away and at home and it's going to be very tough, but we have to keep going."