I had a 03 HO cummin it got 21-26 mpg done by hand. Well i wrecked the pu and my first choise was another dodge. But now i'm wishing i got a GM diesel. The 06 is getting 11.6-13.5 mpg, i've put air filter,ez and now smarty with no inprovement in milage. Anyone tell that happen, why is the milage soo bad.

 

Dunno why its that bad but those numbers are identical to mine and I have an EZ now......... However when I had the Six Gun I got 17 consistently...... Something tells me I should of kept the Six Gun......

 

How many miles on it? and have you done the white smoke/slow start reflash yet?

 

My 06 is now getting 16.5-17.5 city/hwy combo 30%/70% hwy since having more miles and the reflash. I hit 18.2 on my fillup today, the driving consisted of 65-70 mph Hwy and a few hard take offs in town. Hopefully your mileage will increase in time. I have had my truck since new and my worst tank to date was 15.2 and that was the first one. The reflash added 2mpg's and for some reason makes my tranny shift smoother.

 

Mine was an earlier model....... Maybe I should get the reflash it starts like crap to...........

 

03-04 trucks got better fuel mileage due to no third injection event. 04.5-07 all have the third injection event and as for reason get worse mileage than the 03-04. Thank your EPA for that

 

18 MPG....TST helped bring it up about 1 MPG..