Was thinking about this. I remember seeing us beaten by Liverpool in the seventies. According to the forum archive, it must have been ‘76. It was strange, because the match was ebbing and flowing, with no-one clearly dominating. Then they brought on this ginger, Fairclough, whom some of you will remember, with about fifteen minutes to go. Bang, bang, bang. Three goals from him in what seemed like about ten minutes at the outside. Fairclough was known familiarly as ‘supersub’. Never seemed to get a full game for them, often seemed to score when he was brought on. I remember we walked down the steps from the Kippax a bit shell-shocked, not quite understanding or believing what we'd just seen. It didn't seem to correspond to the whole game.
Then I saw that 4-1 defeat from them (again! the bastards!) in 2015. No mystery about that. Pellegrini's last season. That was the game in which it became painfully clear that Yaya's days were nearly numbered. He had Fernando next to him — frankly, his time never came in the first place — and Liverpool were just running through us at will.
Honestly, I've never got to Maine Rd or the Etihad as much as I'd have liked to, so I haven't seen us lose often at either stadium, and certainly not heavily. So Saturday is in fact the heaviest defeat that I've personally witnessed (and even then, I cheated a bit, because I'd been dying for a piss for about fifteen minutes and nothing much of any interest or significance seemed to be happening, so I got up and left on about 85 minutes, something which I never, ever do, so didn't have the ‘pleasure’ of seeing their last). It was very strange to see it against Spurs, because they were really not a team I expected to see City's heaviest home defeat against.
Wonder what other people's experience of seeing us badly beaten at home have been.