Okay...
Just got home, and drained another jar out. I put some on my fingers and rubbed. Has an oily feel to it. Smells like diesel. Licked it (yea, I'm gross) and it tasted like fuel.
Figured I do a simple science experiment. Poured the jar into my toilet. All of the jar stayed on top of the water. Did the touch/taste test again. Definitely diesel.
Did a little digging, and found that Shell has "premium" diesel that is completely clear most of the time. Here is a link to another forum where a member was asking about it as well;
http://www.thedieselstop.com/archiv...42&page=49&view=collapsed&sb=5&o=&fpart=1.htm
Since my truck is running like a top, I'm not really worried anymore. I will go to a different place from now on, as I don't like the idea of clear diesel.
As far as my MPG drop, I put on 2 Ranch Hand bumpers and a winch, so maybe the extra weight is doing it.
Thank you all for the help. Great group of people here on the forum.