Censored no matter what i do exaust,filter ,programmer etc.fuel mileage is the same.with truck set to stock the dic says 17-18 but hand calc it is 14- 15.truck with 65hp tune dic says 18-19 hand calc 14-15. so i finally tried the 90 hp tune and was very impressed the dic said i was getting 21mpg until i hand calc it today and got 14.5!! so far i am getting very irritated. i am running 285`s but have recalibrated the speedo with the programmer. other people i know are getting 20-21 mpg with thiers. i have almost 7k on it.it is a 4x4 crew cab shortbed. any advice is appreciated. thanks:help:

Never Trust Your Dic:lol: realey the dic canot cumpute for programers using more fuel, and will always read better fuel milage than you actually get , mine says 18 and I hotrod it more than Mario Andretti but in reality if I figure it out by the tank I am at about 15 or so:ro) :ro) :ro)

I had an 04 CC 2500 HD and the DIC consistently listed my fuel consumed as being at least 10% less than how much fuel I would put in it. Tanks after tank it did that and I filled up at different stations on the off chance that my normal station was short changing me. But, the same thing happened every time. In your case, you seem to be off more than the 10%, but I know that I also saw 23+ mpg on the DIC on occassion as well on flat terrain. the following fil up didn't agree with that, though.

My 05 doesn't tell me instantaneous mpg, but I'm not sure if that is because it is an 05 or because it is a 3500. Does anyone know? Is it possible to get it reprogrammed to show the instantaneous mileage? I used that function quite a bit in the 04 and I miss it.

Bert

Common question-All tuners/programmers will throw the mileage readings off on the DIC.. to get accurate numbers always do it by hand.

BertP

I think you only get the option of looking at fuel , Instant ,trip ect if you have steering wheel buttons. If you got them you should be able to see instant mpg. If you want serch the forum on the topic "dic" I think I saw an after market gauge which will do all that stuff for you plus read and clear codes.:cool: