UPDATE: We ran a load that left Tues and just finished today, 04-17-09. From CA to AL. It weighed 4 times what the first load with the mud flaps weighed. This one was 32lbs vs. the 8lbs on the last load. Mileage ran from lowest to highes, 10.54mpg - 11.15mpg. Speed was between 57mph - 63mph. We...