Lok,
Thanks for your thoughtful comments.
I agree that there appears to be an optimal "urban use" cycle for the NX - and very low speeds <20 mph do not fall within this definition. I must admit that this is not something I was expecting: indeed I was hoping for extra mpg at lower stop start speeds. It's ok; just slightly disappointing imo. As other cities/towns introduce lower speed limits, I suspect others may have the same issue.
I agree that that the mpg might improve - although it may not - as I haven't been using the A/C and this typically would decrease mpg by ~ 10%
I placed the order with Lexus Twickenham in Oct/Nov 21 and the car actually arrived very suddenly in the middle of December 22. Initially, I was told that it HAD to be registered in 2022 (likely to make annual sales numbers) which would have been very inconvenient as I was in Australia. After a LOT of fuss and a formal complaint, I managed to get it deferred to March - in time for the new registration.