Just took my truck in complaining of bad mileage(10-11mpg), and was just told that they flashed it. I had taken it in before for the reflash, but my serial number didn't require the flash. Now I'm told that there was a new TSB flash just released last week.
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Hopefully, I'm getting better mileage now. Just so you know I have a 99 QC 3500, auto, 3. 54's. It is a welding truck and is near or slightly over GVWR, and gets driven at 65 or 70 on the highway. It has 26000 miles on it, so it's broken in.

Hopefully, I'm getting better mileage now. Just so you know I have a 99 QC 3500, auto, 3. 54's. It is a welding truck and is near or slightly over GVWR, and gets driven at 65 or 70 on the highway. It has 26000 miles on it, so it's broken in.