mine was built dec 05

 

dont worry about what flash to get . just ask them to load the latest ecu program out . had mine done 2 days ago and my over head went up 3.1mpg in town on the way home from the dealership! will see if my actual mileage went up this weekend and post results monday. just complain about hard starting and poor mileage and ask them to update your program. it was free!

 

Acetone mixed with gas was busted by Mythbusters. It actually gave them poorer miles to the gallon.

I did some on-line research and it seems that a Tonneau Cover (Undercover) DOES help as it streamlines the bed area. This was PROVED by REAL scientific tests. Maybe 1-3 MPG depending on speed (city vs.highway). The highway speeds would get the better (3MPG) as there is more air turbulence coming into play.

 

I have been reading real tests of people before and after with a tonneau cover and they are sayin .5mpg. The toneau cover isnt a miracle worker.

 

My Mega started off at about 12mpg. At 13k miles I'm at about 17-18mpg with the cold start reflash. It's not a fuel mileage reflash you're after. I recently towed the Jeep over the mountains and back. Averaged about 14mpg.

 

I feel your pain.....This is my 3rd CTD and I never saw a magic break in where it went from 13MPG to 20MPG....the break in story is very true but is a small increase over time....and not 7MPG either! At least in my CTD's But this "06" I have now Pi**ed me off when I first got it 13-14MPG Hand calc sucked...It didn't matter what kind of driveing....Then I had a CEL "battery rational sensor" at 200 miles. Took it in and they reflashed it with the TSB 18-05-06. Overnight I got a 20 on the highway and 15ish in town. I just got back from a 575 mile round trip pulling a utility trailer...2500 lbs over a stiff pass and got 16.5 MPG...did a short 90 mph to see how it felt Got 4500 miles now. ....Milage is not as good as my "03" was but like it was mentioned before...MORE POWER! There is no MPG flash just the current fix..all....Get the flash I haven't heard of anyone complaining after they had it done... unless you have a 03-05 and now you have the Park reverse horn feature!

 

My milage is pretty bad too. 16.5 is about the best I can do for 40/60 city/highway drving empty.

I went to the dealer yesterday to see about any TSBs. I gave them the long crank on start and white smoke line. They said, "Sure we'll update anything that needs it. I think there is even one that will help your fuel economy."

The work is scheduled for Thursday (they only have one diesel tech). So, I'll let you guys know what happens.

 

Just a follow up on my previous post. I have a whopping 200 miles on the truck now. When I took the truck to have the 5th wheel hitch rails put on, I took it down the interstate. At 65 MPH, curise control on, the read out showed me getting 20.3 MPG. I later bumped it up to 70 MPH and it dropped to 19.7 MPG. Not too bad for not being broke in.

 

After I read this I thought I would hand calculate mine............Mine was built 3/06 it has 2600 miles on the clock.....the hand calculation was 16.333 and the overhead read 17.4..........it's not 20 but hey its not too bad in my book.......

 

06 Megacab/ auto...

I got 14.5 pulling my 7x16 enclosed trailer with 5 bikes in it doing 70-75mph.
Truck has 200 miles on it.

 

Maybe those Myth Buster guys aren't very accurate.
Go here for information on acetone as an additive.

MANY people have reported the results of their own tests.

 

Well, I just picked up my truck from the dealer. They performed the “recall F19” (fuel tank roller over) and, most importantly, “updated ECM per TSB 18-041-05”.

Let me tell you, I have seen number on my overhead mileage display that I have not seen before. I reset the overhead as I left the lot and the first number I saw was an 18. I thought “Ok that is an improvement”. I had, to that point, never seen a number above 17.1. Then I go to the interstate. The numbers kept climbing. They finally stopped at 24.1. Like I said, I never saw numbers that high.

I know that the first 15 minutes is not a fair representation of future and overall mileage. But, boy those numbers just made me feel good even if the truck was pouring diesel out the tail pipe.

I’ll top off tomorrow and then I’ll have to fuel up on Sunday or Monday of next week and I’ll let everyone know if anything changes for an entire tank.

Initial review: get the ECM flash and feel good for a while even if it only changes numbers on a display and the truck runs the same.

 

Mine goes in next week for the rollover recall. I also mentioned to them that the transmission seems to be hunting under light accelleration and that there may be a driveability TSB out for the truck. I think they are planning on hitting it with the reflash when it goes in.

One thing I have been worried about is whether or not there is a performance disadvantage to the flash. Similar to the rumor that Ford's solution to burning turbos and blowing head gaskets was to reprogram the computer to lower the maximum boost allowed and when it was applied. A lot of PSD owners claimed they lost a lot of the snap in their trucks after the reflash was done. Could dodge be limiting the boost based on throttle input to help reduce fuel consumption? Don't mind me... I am a "conspiracy theory" guy. I still think Micosoft is the one who creates the viruses that kill computers. ever notice that if you never update Windows 98 online it runs flawlessly for years. But the minute you try and update it (not supported anymore) it crashes soon after? Of course... you don't have the latest software. Ok... off the box now.

 

I'm hearing more and more people say that the reflash isnt giving real world MPG improvments. EVERYONE is reporting incredibly high Overhead numbers, but when they do an actual hand calculation, the numbers are coming out about the same as what they were before. Maybe the reflash only changes the way the ECM calculates the fuel mileage, as in it changes some value in the calculation.....
It shows me that you cant trust that overhead for anything but relative comparisons.

 

Until I see proof that the mileage has changed, I am going to say the overhead was just reprogramed to display higher numbers. We shall see...

It is nice at least looking at the higher numbers, though.