Hi Brydo,
No surprise there, as discussed before on here. If charged fully overnight and used primarily for shorter and urban trips, I can see the point. Especially tail pipe emissions on the school run. Sadly, most of the super expensive monsters are bought on business for the huge tax benefits and rarely charged. Reports of charging cables never used over a lease. They achieve the exact opposite of their green image. Overweight and emitting far more CO2 than the pure ice equivalent. Mining of lithium and rare earth minerals highly polluting. Taxation policy is idiotic but again, no surprise.
Harrys garage on YouTube has a test and six month report of real world use of a BMW X5 45e. 52.8 mpg is very impressive for a 2.5 ton 6 cylinder 3 litre and better than the ICE. But as he says, you have to plug it in.