My engine was built in March of 04 so I don't know if it is eligible for the mileage reflash or not. I am averaging around 18 MPG doing mixed driving. This weekend on one leg of my 650 mile trip on Interstate I averaged 19.7 MPG driving 70, computer reading which has been within a tenth latey. On the way back I took the state highways through all the little towns, speeds up to 70, and averaged 19.2 hand calculated.

I am getting good mileage now so would the reflash make it better or possibly screw things up? Is it true that once they do a reflash it can't be undone? Should I just leave well enough alone and be happy with what I have?

The truck is about 10 months old and I now have about 46K miles on it.

 

Here is the info that should help you decide:

http://dodgeram.info/tsb/2004/18-037-04.htm

The reflash did help with making my computer more accurate and increased my actual mpg.

 

You are getting good mileage. I had the flash done and am getting the same mileage as before the flash. 14.5 mpg mixed city/freeway driving. Leave it alone in my opinion.

 

I have a 3/04 build (engine) and had the flash done. I was getting 13-14 in town. The flash raised that by about 2mpg and it eliminated the pinging sound.

That said, if I were getting the kind of mileage you are, I wouldn't touch it.

Neil

 

I bet you already have the reflash from the factory with the March build date, but you might want to check as i believe the "reflash" cal came out in early March of last year. I know a lot of engines down in Mexico were reflashed a few weeks before that.

I would check to see if your engine qualifies first (based on engine serial number). I have lots of experience with calibrating these motors, so I wouldn't be afraid, but I can certainly understand NJMurvin's perspective.

and to answer your question, you are right , once you get it flashed, you can't go back. But then again, its not what you know, its who you know.

 

Joe N.

I had the TSB done about 10k miles ago. It did not change my low mpg at all. I would love to get the mileage you get. Mine is still 13.5-14 city 16-17 highway.

I would NOT do it if I was getting your mileage.

 

Are there any negatives to getting the re-flash? It can't hurt right?

BTW, should the dealer do the reflash at no charge if I ask them to? My truck is going in early Sat. morning to have a keyless entry installed. I'm strongly considering getting them to reflash it while its there. I'm only getting 14-15mpg with mixed driving conditions.

-daniel

 

I just bought an '04 quad cab/2WD/auto/dually/3.73 that was built in June of '04. Highway cruise (60-70mph) averaged 16-17 mpg. The computer showed about .6 less than actual figuring between topping the fuel. Drove from Ohio to FL so I had a few fill-ups.

It had 5,425 miles when I started, but I expected at least a little more. But from what I've read, it should improve as it breaks-in. Then I'll add synthetics. But I do plan to get the TSB flash and the dealer said that it will be at no charge.

Your mileage and options will affect fuel economy.

 

dgm

I dont think it can hurt anything. I have seen some that believe they lost some power after the TSB. I didnt really see or feel any change except for the overhead mpg calculations. They went from being lower than hand calculated to being higher than hand calculated.

 

Hmm? Any other opinions? My truck goes to the dealer at 8am tomorrow... Flash or no Flash?

-daniel