[Tf175]

Towing 28 ft enclosed trailer, probably 10 k # , 4.9 mpg . I try to maintain 60 / 62 mph , but end up 65 /70 if not careful . Pushing a barn door takes muscle , coach aero package not great . As an aside , I isolated the main and aux tanks on a trip in October to get a picture of generator fuel usage , .54 gph .
I think your DDEC engine is more fuel efficient , won't be drastically affected by the pick up in tow .