So I haven't driven it much, my wife does most of the driving, but I'm curious, does the MPG values on the screen represent the combined ICE/Electric? or just ICE? Last time I was in it, it said 28MPG, which wouldn't be bad if it was just ICE, but would be sort of bad if it was combined. We have done several 65 mile trips, so that would put 40% electric and 60% gas.
I've only got about 5K miles in two different PacHy this last 5 months, but I would suggest to you that you cannot accurately use the screen readouts on mileage. They are fun to look at, but for a variety of reasons, don't accurately reflect the true mileage you are getting (unfortunately).
Just for your peace of mind to know what you really get, next time you are going to take a long road trip over a day or two and not plug in between full tank after starting the day, then full tank at the end of the trip, do your own calculation to get the mileage. YOUR calculation of the total odometer reading at the end of the trip minus the odometer reading at the beginning. Then take off 30 miles for the full charge battery you had at the start. Now take that mileage number and divide by the gallons put in at the end of the trip to top off. This will give you your TRUE hybrid mileage.
I've not found a way to use the displayed numbers otherwise since it is difficult to separate the combination of plugged-in EV miles and ICE miles. You will find even if starting out with zero charge, you will accumulate EV miles on the display. So this I think really messes up the ability be accurate just using the display since those accumulated EV miles are displayed in the same set as the plug-in EV miles. Do your own once or two day calculation on a long road trip to get an idea of your true numbers.
I could be all wet here if someone else has figured out an accurate way to use the display, and thoughts folks?
ps. my signature area shows the mileage stats I found that I get. Would be interested in seeing if yours are similar, but would suspect so....as long as you aren't doing lots of high speed driving 70+MPH since that really increased wind resistance and reduces mileage in any vehicle.