Rear gear recommendation for highway.....

What rear gears do you run? Trans?

2.73's with a 42RH overdrive and converter lockup.
26" 15 inch tires.
Also pressure switching from the governor port for fully automatic shifting for OD and lockup.
It's going to get an 8.25 locker with lower gears before long, hopefully this winter but it's a freeway runner and 25 miles to the gallon with a 350hp Magnum naturally aspirated.