Towed a Timeout popup camper to Inzane, 1600 miles and back. Kept speeds down for safety, max about 70. Heavy crosswinds, tailwinds, headwinds. High temps destroyed mileage. Trailer with camping gear, clothes etc. for sure 600 lbs, up to 700, didn't weigh it. Boxy shape. Tire Austone Taxi kept rpm's down typically max 3100, much at 2600. Mileage ranged from a minimum of 18 to a max of 30. Most of the time it was around 22. Mileage normally at 34. Was the same consistently on the high-speed ride to/from GOTF, most of it at 80 actual, sans trailer. The belly tank was a necessity with the trailer. Used fuel at such a rate the Dan-Marc was too restrictive; had fuel starvation issues. Replaced it with a larger solenoid on return.
Jade & Timeout camper on the road:
This is a big camper, the largest available for motorcycle towing:
