Seeing average MPG on display on Prius 2?

I have a 2012 Prius 2 as a long term rental right now while my '09 gets unwrinkled from a recent crash.

I can't find any way to display the average mpg like I can on my '09. The multi-information display on the upper dash just toggles between the settings screen and the trip odometers; nothing up there about fuel consumption. I assume that's because the car has the Display Audio stereo, and such information would show up on the stereo's screen. However, the stereo only toggles between the energy flow screen, and the 30 minute consumption bar graph, neither of which show what the average mpg would be since last reset like my '09 does.

Am I doing something wrong or is this just not something that's available on the lower end car/stereo combo?

 

That's the problem, I can't find any way to get the HSI display on the MID, either. Am I SOL?

 

I know where the MID is, but the "DISP" button is not getting me what you say it will.
Here are the only two screens I can get out of the MID:
In the first screen, hitting "TRIP" just toggles between the odometer, trip A, trip B, and blank. Hitting "DISP" just toggles between the two screens represented in these two pictures (the one with the trip odometer, and the one that says "SETTINGS (PRESS AND HOLD)")

So, what am I doing wrong here?

 

For further reference, here's what I get when I press the "CAR" button on the stereo.

Pressing the "Consumption" or "Energy" button toggles between the two screens, but neither of them show anything about average MPG.

 

Yeah, that's confusing in a number of ways. The setting is actually labelled "SCREEN OFF", and I never selected that, because the screen is obviously on, and I didn't want to turn it off. Then, when you select the "SCREEN OFF" item from the menu, you have two choice, "ON", and "OFF". So, if I select "ON", am I turning the "SCREEN OFF" setting "ON", thereby actually turning the screen off? That's the way my more literal mind would process it, but no, selecting "SCREEN OFF", then "ON", restores all of the fuel consumption and energy display functionality.

Since it's not actually controlling the behavior of the screen itself, but rather what's displayed on it, the menu item in settings should be labelled something like "DETAILED ENERGY INFO" or something like that with two items in the sub-menu, "DETAILED INFO SCREENS ON", and "DETAILED INFO SCREENS OFF".

The wording on this menu item is just making the user interface geek part of my brain cringe.

Anyway, thanks for the help.