Just bought the truck a couple of days ago. At first it got 14mpg avg with mostly freeway driving. Read up on additives and decided just to try the Lucas first. Drove 270 miles yesterday with 50 of that in town miles. Averaged 18.7mpg. My freeway speed is 80mph which for me is 2500rpm. It cost me $10 for a 32oz bottle. So I can get three fillups out of one bottle. I really need to get the best mileage I can since very soon I will be commuting 240 per day with the truck 4 days per week. Now I need to find a cheaper place to buy Lucas at. Anyone know?