I've gone through all the options, i think. Where is a LIVE MPG? Only when I shut the car off does it tell me my average MPG for that trip. AM I missing it? I've seen the bars on the nav but what I am looking for is the LIVE number image that goes up and down while I drive around (40.8 avg, 41.3 etc) depending on how I am driving at that moment. I've seen it on the Camry 2012...
I don't believe that there is a digital number display for your current mpg, but you should see the arch to the right of your speedometer that shows you where you stand between 0-100mpg.
Ding...ding...ding.... correct answer! There is no instantaneous numeric mpg display on the 2012 Prius, just the bar indicator as stated above.
On my mdl II, jogging thru trip setting, I come across the 'A' trip witch seems to have a read out, COMs I think it is called. show mileage, mpg, odometer for that trip, which mpg does change by my driving, but it really about 2mpg higher based on gas in and mileage driven on fill ups.