mpg readout

Just joined and first post :) Recently bought a 2021 Big Bend 2.7 v6 SAS (4dr)with upgraded steel bumper, winch, Tuffy security drawer in back and lots of other upgrades. Put my first tank in and drove from Sarasota to Daytona, then drove around the city, about 60/40 fwy. Results: 19.6 mpg 350...

Just curious what’s the highest MPG you have been able to reach on the read out. I’m hanging at 21.3 right now.

I looked in the index and I do at the dash clusters but I see no reference to the mpg value that is displayed. The analog gauge goes up/down but the value is stuck on 17.8 Do I need to reset it? The user manual leaves a bit to be desired.