"There is no way we will be in this situation again in my time here."
Knowing that victory over Hughes' former employers would have guaranteed their survival, QPR, who had been reduced to 10 men after Joey Barton was sent off, came from 1-0 down to lead 2-1 thanks to goals from Djibril Cisse and Jamie Mackie.
But City struck twice in stoppage time, through Edin Dzeko and Sergio Aguero, to win their first league championship in 44 years.
"If we had pulled it off and won the game, it would have been the greatest Premier League performance in history given the significance of the game and the attention focused on it," said Hughes.
"I congratulate City. It is a huge achievement for them. I am sure there will be many more in the future. We touched the well of apprehension they experienced. It was all the more exciting because of that."
Joey Barton's red card was the ninth shown to a QPR player this season, joining the Sunderland side of 2009-10 in sharing a Premier League record
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