Hi Orider,
We have a 2014 25DS and tow a 2014 JKU. I use a program on my tablet called Torque that connects to the ODBII port to monitor engine stats. It also calculates my mpg to. From that info, it says I get 12 mpg when I am not towing and 9 mpg when we are towing the jeep.
One other thing to think about is that the tow hitch is rated to 5,000lbs.
Brian
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Forest River FR3 25DS
2014 Jeep Wrangler JK
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