Oh, so you guys are saying that by him running 5 tanks of gas thru the car, and upping the grade of oil he use's, and the company that made the vehicle installed a piece of equipment designed to read out the amount of fuel he used is wrong?. And none of what he's done can account accurately for the small increase in mileage ?. He might have changed out a dirty air filter, got out of the brick delivery business, maybe his wife lost weight, filled he's tires up, or he only drives with the wind at his back. He gained some mpg and he's happy, why mileage shame him for his small victory?..,,,