[Jimmy N.]

After reading what others are getting, it was a pleasant surprise to get 16.85 mpg during a trip in the Rockies.
That's obviously with plenty of elevation changes, cruising at 75-85 where the roads were straight enough, and lots of foot-to-the-floor passing.
That was only two fill-ups, so not a large sample, but still.

Getting 10 seemed like a distinct possibility the way I drive.

 

[Jimmy N.]

I averaged 19 on a 7200 miles trip (Houston tx to San Ramon ca to Seattle wa down to Portland or and back to Houston.

If you're going by what the Lie-O-Meter says (which usually isn't accurate in the first place) that 19.0 mpg reading reflects the last couple of hundred miles or so, not the average of your 7,200-mile trip.

I can make mine read just about whatever I want, depending on when it was reset, how long since it was reset, and how I'm using the throttle when taking a photo like that.
But hopefully you keep track of your fill-ups, making it easy to find out what the actual mileage for that trip was.

 

[Jimmy N.]

Uh, oh. I thought my Hellcat got low mileage.
Guess I won't be cruising along at 100 or so with the new "box". The gas stations are too far apart around here.