I didn't keep track of gas mileage on the trip going east but did keep track coming home (west). It was all highway/interstate. One-way trip was just under 150 miles. We barely managed 14.5 mpg. The last time I kept track without the trailer, we managed 22.5 mpg going pretty much the same speed. Travelling west we did have a fairly good headwind, maybe 10 mph and the trip seemed more hilly than I remember without a trailer
The Suki pulled fine, it never felt like the trailer was going to throw the tug around. The XL-7 has always felt "heavy" to me, no more or less so with the trailer. I let it dog it's way up the bigger hills. I would have liked a little more horsepower, no complaints about torque though even backing it up our pretty steep driveway. Overall, I am really glad we stuck with a 13' camper.
Does anyone know if gas makes a difference? Will the higher octane make a difference in power and gas mileage? Some other performance questions, we do have an A/T Power switch which the manual states moves the shifting points higher. Is this for hilly terrain? How hilly should it be for me to use this? Same with overdrive, I can turn it off, but I am not sure I want to see what gas mileage looks like if I do.