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For those who are interested, I found a great website for tracking fuel economy. You can add a fill-up in about 10 seconds, and it will track and chart your fuel economy.
That's a pretty cool resource! I poked around a little bit and was amazed at how poor the reported mileage was on the 6.0s. Mine always averaged 16.5 to 17.0 in the summer and about 1.0 to 1.5 less in the winter.
So far my 6.7 is just about on target with the 6.0, but the 6.0 would definitely blow the 6.7 away on pure highway miles. Hopefully that changes as I get more miles on it. It's currently has just over 2400 miles on the clock.