Does anyone know of any issues with these? I have T&C base model with the 3.3. Spec says 20 gallon fuel tank but even when on empty I've never been able to get even 16 gallons in the tank. Mileage display shows 19 mpg around town. The most miles I've squeezed out of a tank (before I chickened out with the gauge so low) is 260. At that point I was able to get 15.7 gallons in the tank. Any known issues with gauges or tank underfill on these?