A hat-trick from Carlos Tevez and a double from Sergio Aguero were topped off by a late strike from Adam Johnson to make light work of Norwich who had briefly got back into the game after Andrew Surman scored shortly after the break.
Mancini’s men were in superb form as they ran riot over Paul Lambert’s side, and despite back-to-win wins, the City manager continued to insist his side can not catch Manchester United.
"It is impossible. The title race is finished," Mancini told reporters.
"I think it is too late, I am happy now we play like we did in the first 28 games now we don’t have a few players with injuries.
"For me it is important we finish this season well and have as many points from now until the end."
Tevez was in imperious form in front of goal and has now scored four in his first two starts since returning to the City fold. Mancini was delighted with the striker who he had once claimed would never play for Manchester City again.
"I think all the team were terrific, I mean [Carlos] Tevez scored three goals and [Sergio] Aguero two but this is their job so I am happy," he said.
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"I have had Carlos for only the last few games and now he is better, he has improved a lot with his attitude and his strength but he is not 100 per cent though I am happy today because after 48 hours he has played again and scored.
"Everyone can make a mistake but I think it is important when you apologise that your manager forgives you because it is impossible to be perfect.
"Nobody is perfect; all of us can make mistakes."
Mancini insisted that he was happy with his players' efforts this season despite being underdogs to snatch their first title in 44 years.He explained: "I think the team did well without Carlos for six months and this is the first time that Manchester City fight for the title. We played well and we were top for 28 games so I am proud of my players."
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