Pep Guardiola's men got off to the ideal start when the two Silvas combined - Bernardo passing to David - to score in the 13th minute though they had to wait until early in the second half to extend their lead when Sergio Aguero finished off a lovely one-two with Riyad Mahrez.
"Little by little over 90 minutes you need to impose your game, your job and your individual quality or physical strength", said Emery.
"So, when I analyse the game - you can go for stats, that's the way people who don't understand football analyse, with stats - I don't go for stats".
United have at least shown some resilience in recent weeks, coming from behind to beat Newcastle, Bournemouth and most impressively Italian champions Juventus in midweek.
Aguero was involved in a passionate discussion with manager Pep Guardiola, and the striker revealed after the game that he was telling his manager how he felt he was able to continue.
"We played two games away, hard ones, where the second game was against one of the best teams in Europe", he added. All England and all Europe is going to watch us.
But a late flashpoint saw Juan Mata take issue with Sterling as he showboated in the final seconds, keeping the ball in the corner and performing stepovers as United players rushed towards him. "It is different from a bad performance". "The performances, the mentality, the togetherness, belief, the fight until the end is something we are building and we are not going to lose that because of a defeat".
"Everybody has to agree", Mourinho said.
"The most important thing is reacting in a situation like that and that was brilliant. The last 30 minutes we played really well".
"We knew that there is a difference in potential".
"Liverpool, Chelsea, Tottenham and Arsenal, they have numbers to be champions, not just Man City", said Guardiola, who extended his own personal record against Mourinho to just five defeats in 22 matches. "Now we have to go for it and try to build on what we are doing". "That is not an excuse".
Mo Salah, with his eighth goal of the season, and Xherdan Shaqiri sealed victory for Juergen Klopp's Liverpool side over the league's bottom team, keeping them in touch with City. The one thing he hasn't delivered answers to are the same issues which have plagued United so far this season and leave them languishing outside the top four.