I assume they get 11-12. That's what my heavy Tacoma's would get and that's what I get with my 6.2L F250 with 35s and a FWC. If I keep it under 65 I can do better. I have huge axles, brakes, and fit 35s stock. The FWC isn't really heavy enough for the camper overloads on my stock springsI didn't notice they put in a 33 gal tank! Good for range bad for payload.....using @calicamper calcs of 6-9, lets assume 8, looks like we are still at ~250 miles range. I bet a full size gas rig is better than that....I know my Ram 2500 hemi gets better MPG than my 2019 Ranger towing our 20' trailer in hilly terrain....I'd expect a full size gas rig to get 9-10.