Why L5P Duramax Tuning Won’t Save Fuel Like Your Old 7.3 PSD Did
Modern diesels like the L5P Duramax start from a much tighter factory calibration than older trucks like the 7.3 PSD — here’s why that closes the door on easy fuel economy gains.
-
-
L5P Duramax Tuning: Why the Factory Left Nothing on the Table for Fuel Economy
Why the L5P Duramax gains almost no MPG from a tune while older diesels like the 7.3 Power Stroke did, and what you can realistically expect from the Derringer and full ECM tuning.