Ron,
I believe your 06 has the 6.0 diesel without the DPF. The 11s have the 6.7 diesel with a DPF.
We have a 08 diesel with the DPF and average 8.6 mpg. That mpg is about 78% towing. The new 11s run about 3-4 mpg better than the 08s
Without the DPF your mpg will be considerably better.
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