Information here and on BMW isn't consistent as BMW conservatively rates vehicle performances. The B58B30M1 is under-rated and last time I converted xDrive40i technical specs of 0-100kmh of 5.5 secs = 0-60mph 5.3secs.
And BMW re-rated 0-100kmh for MY21 45e 5.6 secs = 0-60mph 5.4secs.
The 45e 0-60mph advantage isn't substantial. There's inconsistent information here and on the internet to stroke everyone's 0-60 e-penis.