What a great post, Nigel. And thank you for the detail!
Well-done, too. My RX (same year, almost identical mileage - isn't achieving that mpg, though I suspect that the first mile from home is always uphill doesn't help! (and I tend to drive it on Sport mode too!)
Like you, I consciously let the car carry the speed, and not the right foot, and aim to never come to a stop at traffic lights, but a rolling approach is always better for mpg. (currently 34.5)
I've convinced myself that E5 produces a better mpg than E10 by between 4 & 5%, and so use that whenever I can find it at a similar cost premium to E10.