Actually, the Sienna is about 1 MPG better than my Pathfinder. The Pathfinder is 4 WD, but the engine is 10% smaller. The weights are about the same. I seem to be getting the same, or only slightly below, what most people are getting. I am relying on the computer. I rarely fill it up twice in a row since it is my wifes car. She would never remember to reset the trip odometer, so that's out too. She doesn't even see a reason to wash it, "It's only going to get dirty again".
