Emmanuel Adebayor (two), Craig Bellamy, Carlos Tevez, Patrick Vieira and Vincent Kompany were all on target in a 6-1 win at Burnley as City took full advantage of Tottenham's defeat against Sunderland to move back into fourth place in the race for a Champions League spot.
Mancini said: "It is a good position to be in and an important one. But it will be more important at the end of the season. We have some difficult games ahead and we need to show the kind of concentration we did. If we do that we have a good chance as it is going to be a battle with Liverpool and Tottenham."
The Italian added: "We played very well, especially in the first 25 minutes, and were focused as we wanted to win the game. We pressed high up the pitch and had a lot of ball in and around the box which gave us some chances."
Adebayor started the ball rolling in the fourth minute and added his second on the stroke of half-time.
In between Bellamy, Tevez and Vieira, with his first for the club, also found the target.
Kompany added a sixth in the 58th minute before Fletcher got a goal back for Burnley, who are facing a swift return to the second tier following last season's promotion.
Burnley manager Brian Laws apologised to the supporters after seeing his side cave in.
He said: "The game was over after the first seven minutes. The supporters and myself didn't expect that. They opened us up and killed the game.
"I apologise to the supporters for an awful display. It wasn't good enough and was unacceptable. I feel I am getting full commitment from the players but I am disappointed and feel let down. Everyone is in shock. It was incredible. However, I've got to pick them up as we have a massive game against Hull next week."
Source: PA
Source: PA