The pitch sounds reasonable. Plug in a programmer, select an economy tune, pick up a mile or two per gallon on the highway and let the fuel savings pay for the device over time. Plenty of people in diesel forums will tell you it…
When you are standing in someone’s driveway looking at a high-mile used diesel, the seller is motivated and you want to believe the truck is what he says it is. That’s exactly when you need someone who has no stake in the outcome and…