Sane effectively sealed a fourth consecutive league win for City when he fired home after being played in by David Silva.
The Wearsiders are in serious relegation danger after winning just one of their last nine league games. Manchester City looked in a different league to Sunderland, and in all probability come the end of May, they will be.
Had they enjoyed better fortune, Jermain Defoe's 20th-minute shot on the turn from Fabio Borini's astute pass might have gone in off the post rather than cannoned back off it, and the Italian might have been able to adjust quickly enough to head the rebound on target.
Yaya Toure broke from his own half to feed Silva, whose ball found Raheem Sterling wide on the right.
Certain domination, the game sewn up by half time and a coasting second half with the opportunity to take key players off the pitch early for a rest.
"What we have to do against the big teams is stay in the game for as long as possible, because we know we're Sunderland, we're hard workers". If Stoke can be 3-0 in just over half an hour then God knows what your brilliant boys like Aguero who will walk through our non existent defence, Nasri and Fernandinho will do. David Silva slid the ball into Leroy Sane's path and the German made no mistake, finishing emphatically past Pickford.
Another Jewish cemetery is vandalised, this time in NY
Since Thursday's events, cemetery officials have had time to reflect on the mark the vandalism has left on the public so far. A spokesperson for Waad Hakolel Cemetery said the damage was brought to their attention within the last several hours.
Which Premier League side has collected the most yellow cards this season?
"We have to do what we did in the past few years, which is get out of where we are".
Despite 30 minutes remaining, some Sunderland supporters made for the exits but they were nearly made to regret their decision when Sebastian Larsson was prevented from scoring from an acute angle by Willy Caballero.
"I feel we are playing quite well and that's why we are getting results. No one in the dressing room is saying we're down". "Confidence is the key in modern football, as Leicester showed last season - they won the league with an average team".
"You have to judge us and our performances".
The other matches in the away streak were FA Cup games to Crystal Palace and Huddersfield Town, along with Premier League wins over West Ham United and Bournemouth.