I have a 23TR so I can attest to the Ford 3.2. I get 15 to 16 mpg driving average 70 mph. What I have seen posted on Thor Forums is that the Mercedes engine is nearly the same. If you are concerned with mpg you are probably also interested in maintenance costs. That is where the disparity would be between the two engines. Mercedes are quite expensive to maintain and far fewer dealers for warranty issues. I would also doubt the extra length would be too much of an issue as far as mpg.
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2017 Gemini 23TR Ford chassis w/ power stroke 3.2
DW, Daughter and 2 dogs, Sofie (black lab/boxer) and Phoebe (schnoodle)
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