My MY2016 LR4 has 126k miles on the odometer. In mixed driving it is currently getting 19.8 mpg within the last 360 miles. On a trip from Seattle to Vancouver, bc it got 22 mpg. These results are from the onboard computer. This is driving between 65 and 70 mph max speed. I'm really impressed with the scv6 engine as I was expecting it to suck after reading all the internet posts. I don't think my stop/start works. I've never had the engine shutoff. Climate control always set to auto. Tires at 35 psi. All season tires.
I haven't owned the lr4 very long. When I initially got it I was getting at least 18.5 mpg mixed. I did an oil change and added some tribotex to the engine but that's it.
With my v8 LR3, I typically get 16.5- 17mpg mixed and if it's only freeway miles, I've gotten as high as 20.5mpg on an entire tank worth of fuel (no stops).