I just got back from getting the Re-flash done at my dealer. On a 5-mile stretch of road, cruise set at 54mph my overhead comp. said 18.7mpg on the way to the dealer....on the way back, under same conditions the computer was reading 22mpg. And maybe I'm imagining things, but the response seems to be better now and smoother shifting....

-daniel

 

you need to do a reset and start your calculation on you next tank of fuel.

 

what is the tsb reflash number for better fuel mileage.
I found a brand new 04 at the dealers with a build date of 5/28/04.

 

Reflash is TSB 18-037-04...

I just had mine done last week. Combined city/hwy avg went from 15.1 to 17.6 hand calc'd. Ironically, this is supposed to make the overhead more accurate, but mine is now a litte farther off, but I'm not complaining. 2+ MPG gain is priceless when paying $239.9 for Diesel.

Other things I noticed after the flash is that the grid heaters have a much different sound... used to be a distinguished clicking, but now more like a buzz. Also sounds a bit different idling, but other than that, truck runs about the same.

Cheers

 

biggrigg600,
Thanks for the report and also on my other thread.