Pablo Zabaleta hit the bar for City as they toiled at a wet and windy Loftus Road while QPR goalkeeper Julio Cesar made a handful of excellent saves to keep the scores level, meaning the Barclays Premier League champions failed to move to within two points of leaders United.
Sir Alex Ferguson's side face Southampton at Old Trafford on Wednesday evening knowing a victory would re-establish the seven-point lead they built up over the festive period but even if the Red Devils are successful Mancini is not ready to throw in the towel.
"We lost two points, this is sure," he said. "But the season is long and I think I can say nothing because we played well, we had the chances but didn't score - that is all it is.
"We are disappointed with this result because we had a lot of chances to win, we dominated this game but when you play like this and don't score quickly it can be difficult.
"QPR defended very well and got players behind the ball and Julio Cesar was incredible."