I've got a '99 Winn 34'with the Ford V-10 and tow a Kia Soul on a dolly. I have problems filling the tank, I guess due to some restriction in the filler tube. I've only been able to actually fill it up on a few occasions. Usually the pump till shut off well before full, so I have to play with it to get as much as possible before I give up. Since I can't reliably fill it, I bought a Scan Gauge. It shows instant Mpg and average mpg, but resets when the engine is shut down. Depending on the terrain, I've seen the instant mpg as low as 1.9, and the average as high as 12-13. My overall average for the 2+ years I've had it is about 7. I've got the 3 speed + overdrive. I would assume the newer 6 speed would get better average.