The life of a Magnum (and 46RE question)
Took my 2wd Durango with a 5.2 auto to Colorado last year. Got between 19-20 mpg at 70 mph. I had a 2wd Dakota with a 3.9 auto, it got 23 doing 65 going to St. Louis. My Dad bought a new Dakota in '94. It was a 2wd, 3.9 5-speed. He got between 24-26 mpg on trips.
I'm not a big fan of the "7's" either. IMO, 2.7, 3.7, 4.7 are all bad news. the 5.7 seems to do better, but there have been issues there as well. That being said, I've never owned any of the .7 engines, so my opinion is only based off or what I've seen or heard.