70.2 mpg on my 12.5 mile commute home. The interesting thing is that in the last 407.6 miles (the mileage since my last fillup) I averaged 53.4 mpg. But over the last 805.6 miles, I averaged exactly the same, 53.4 mpg. My mileage on my commute, which is most of my driving varies between 50 and 70 mpg, depending on traffic conditions, whether traffic is opening up when I'm going uphill or downhill, but I was surprised to see it so consistent over two such distance ranges. Yesterday, I had 94.8 mpg on a 1.8 mile drive, I was hoping to hit 99.9, but close enough.
i believe you'll get a 99.9 when your car is already warm and you can make it to your destination running all in EV mode. (i think) I've gotten a 99.9 on a 1.8 mile trip, it's in my past best records