they are all going to get about the same gas mileage, honestly idk why your even the slightest bit concerned with gas mileage its a big v8 truck your gonna be spending hundreds a month on gas anyway.
but my vote is for the first dodge. but i also agre with him ^ ive seen wayy too many people tear up there dodges id make sure its been taken care of. especially at that price but if it looks good id jump on it.