On our maiden 1600 mile roundtrip between Atlanta and PA with our 05 Scamp 16 SD with most options, towed by our 2004 Dodge Dakota 4.7 auto V-8 2WD;
Normal mileage without the trailer is 19 at about 72 MPH.
Overall average on the trip with the Scamp attached was 15.5 MPG cruising at about 62 MPH. I'll expect a little higher when I'm not crossing the hills in NC and VA.
Kept in in OD most of the trip per the owners manual since it wasn't hunting gears (except turned OD off on long or steep hills), but tried one tank with the OD off for the entire tank and mileage dropped to 14.85 on that tank. It appears that keeping it in OD works best for my combination, and the Dakota pulled the Scamp without effort.
The 6 year old tires
that I was procrastinating about replacing this year will be replaced sooner than later since the curbside tire went kaput on this trip. Funny thing is that I had stopped to refuel 5 miles earlier, the tires
and hub were cool so no temperature problems, and the tire looked fine. I believe I may have picked up a nail or something at the refueling stop because when I looked in my mirror 5 miles down the road the only indication that the tire was flat (and the tread coming off) was just a teensy bit of wiggle and the belly band was no longer level with my mirror when I glanced at it. Now I have to decide if I want to upgrade to load range D 13" tires because I'd like a little more buffer on the tire capacity, or jump up to 14" tires (which likely would require some fiberglass trimming).