This is a familiar story.
If you're not happy, and you have the means, trade it in for something you love.
Life's too short.
Often see posts from prospective buyers about whether or not to get the Hemi, and my answer is always the same.
If your single biggest driver is mpg, by all means get the V6. For that matter, get a Corolla.
For most everyone else, some part of you will eventually wish you'd gotten the Hemi.
And they're actually not bad at all on fuel if you're easy on the throttle.
If it doesn't put a smile on your face, why drive it?
As for 4 wheel drive; For me it's one of the key advantages of owning a truck. Regardless of how often you actually engage it.
It's there if you need it, and it's handy as hell when you do.
Not to mention that anywhere north of about Arizona or east of California, the resale on 2wd trucks is terrible.
The people relating 4x4's to Canadian weather, seem to have forgotten that a good chunk of the U.S. gets winter conditions too.