I’ve been chomping at the bit to get one of these from the first week I owned my 3.0. Online due dillengence does seem to prove that the numbers they claim are pretty legitimate. The 2 main reasons I purchased the F150 diesel was great gas mileage and ease of towing our camper. It appears the Stealth module would be a great fit for me on both accounts as I want to keep things stock to avoid warranty issues. I figured I spend about 12 cents per mile for fuel and DEF. At $600 for the unit, even a 1 mile per gallon increase and this thing would pay for itself in 5,000 miles - or about 5 months for me. The only thing holding me back at the moment is what I’ve read on a couple other chat groups: some users are claiming that even though the Stealth module doesn’t leave a “footprint” that Ford (and all manufacturers for that matter) have other ways of digging deeper into the computer and proving inconsistencies with their history/programming. This could be a major issue if confronted with an expensive repair that the company denies because the vehicle was tampered with even though under warranty. Believe me, I don’t want this to be true and I really want to purchase the Stealth module. Can anyone with better knowledge than me please weigh in on this? Thanks!