I have had my edge tuner on my 2005 F150 FX4 supercrew with 156000 miles now for roughly a week. So far my mileage has gone from a hand calculated 12.5 to 14.1 in mixed driving conditions. My mileage took a major hit when I leveled the turck and put on some 305/65/18s. Overall impressions with the edge tuner are all positive. Increased fuel mileage, power, and more precise/firm shifts were all welcomed.
Note. I was getting around 16 mixed driving before the tires and 2" level.