I drove 200 miles on interstate and managed 18.7 once lol and 15.9 on the reverse trip lol...The only difference I am aware was I might have bee a touch faster coming back.
I have figured out that MPG on the freeway is better if you keep in inder 2k rpms..Today I got 17.9 combo driving.
Mine is RC 4wd as well...
I'm thinking like this, I got 17 mpg on a 2005 Ranger 4wd with the volkwagon v6. The Ford ran well and trouble free but the Ram is way way better and better mileage to boot.
Hopefully it picks up some when I get some miles on her.