Fuel economy /Solitude 310 GK

I am considering the purchase of a Solitude 310 GK. It weighs 5,000 lbs more than my current TT. My tow vehicle is a 2016 GMC HD 2500 with the Duramax diesel. What fuel economy can I expect at 60-65 MPH?

I would guess about 11 mpg.

I averaged 10 mpg towing a 310GK with my 2017 Silverado 2500 HD Duramax. I have changed to a 2020 3500 Silverado HD Duramax, and I’m still averaging 10 mpg. I’ve towed the 310GK about 13,000 miles so far.

I have one with a Ford F350 Dually diesel. If I go between 60 and 65 i get about 10.5 mpg.

You dont need a dually but with a 2500 you may be close to the payload limit of your truck.