Does anyone have any experience with this guy's tunes?
He claims 4 to 7 MPG gain hand calculated, as well as a stronger "bottom end" power band with his DURAMILEAGE tune.
He say on his website:
He charges $395 to re-flash your ECM. Add $300 if you want him to program a replacement (pre-owned) ECM. That way you can keep your original ECM stock.With the capability to "Fine-Tune" over 50+ potential fuel tables and engine functions... our primary tuning option for the Duramax diesel is our High-Mileage Fuel Economy Tunes... which also provide modest horsepower gains of 65HP for improved towing.
A 7 MPG gain would be very impressive, but a little hard to believe.