I just did my third fill up, mileage dropped 1 MPG, and the DIC was way off, like 4 MPG off. And this with a 180 mile trip on rural roads, where the DIC indicated 42-43 MPG. I wonder if my last tank I didn't fill the tank the same. Do you guys fill til it clicks off, or keep trying to fill to the top? I usually fill on the slowest setting so I can check oil and wash windows, without worrying about fuel splashing out when it gets near the top. Mileage won't be accurate if I can't fill it the same each time.