I did a bit a real world research by perusing the fjcruiserforum. 9 out of 10 people are meeting or exceeding the sticker mileage. I'm gonna guess I'll suffer no less that 10 percent extra fuel burning by towing an Escape/Casita..
The Durango got 13.6 mpg city/highway consistently. When towing it averaged about 9 mpg on the
Bigfoot 21. We rented an
Escape a few months ago and the Durango never knew it was there.
If the FJ gets 18/25 I'll be one happy camper.