My ECO MT runs 400-450 miles per tank in the winter and ~500 in the summer. I fill to the first whole dollar after the first click, which means I put 9 to 11 gallons in depending on how low I ran the tank. [email protected], have you talked to a different dealership - your's is clueless. Also, have you gone through the stickies in our Fuel Economy forum to verify the mechanical, driving environment, and driving style impacts on fuel economy.