Drove to Dedham and back today.
Recorded the fuel mileage on this trip with the correct tire sizes in the PCM and ABS controller and no other changes.
4.10 gears and 265/70R17 Load Range E tires at 50PSI.
223 highway miles from last fill.
15.78 gallons to fill the tank.
223 ÷ 15.78 = 14.13MPG calculated.
Instrument cluster says 12.8MPG.
This should change with the tracked MPG info...
Hatzies 2005 2500HD fuel mileage
The transmission still takes a while to slide in and out of 3rd and 4th gears. Kinda like riding the clutch. If it ain't good for a standard clutch I can't see where it would be good for an auto either. I have a tune with the tow-haul pressure table copied to the normal table along with the shorter shift times from the tow haul mode table.
If that doesn't get rid of or at least minimize that sliding feel I'll look into how I can go about shortening the TCC engagement timing without slamming it home every time it engages.