By the way, according to my math, my real mileage, over the 102 miles I drove, is 38.9. If the car was at 15.7 mpg over 5.2 miles, 0.33 gallons had been consumed. By the time I finished my highway drive at the 107-mile mark, 2.95 gallons had been consumed. So I had used 2.62 gallons to go 102 miles, which is 38.9 mpg. Of course this assumes the gauge is accurate and isn't overestimating, but it might be. We'll see in 400 miles when I refill.