Picked mine up last week. While driving home (100 miles), in hilly country, against a 15 to 20 MPH headwind, going 55 to 65 MPH, we averaged 10 MPG with '12 Tundra, 5.7, & 4.11's! Engine never hit more than 3,500 RPM, and that was going uphill, from a dead stop.
Great tow vehicle and TT is built like a rock!!!