greenhorn

My car's DIC is currently saying that I average 36.2 mpg with mostly highway driving and little city driving. I drive about 25 miles everyday roundtrip. Today when I had an empty tank I had racked up about 265 miles on a full tank. Is there something wrong with the car?

2007 Cobalt SS/SC
Mods:
2.9 inch pulley
Injen Intake
Tune
Header
Siemens #50 injectors
ZZP heat exchanger

BPacak

what are you expecting to get haha. 265 miles per tank sounds about right.

greenhorn

What I want to know is why the DIC is almost 18-20 mpg off? This tank of gas i stayed completely out of boost (almost), but the DIC is way off

BPacak

when do you reset it?

greenhorn

Every time that I refill, the MPG usually shoots up to 36 immediately and just stays there the whole tank.

TommyP

iTrader: (2)

when your running aftermarket injectors the injector scaling changes, but the computer calculating mpgs doesbt know that. I thinks you are still on stock injectors. The dic is never right on mpg with aftermarket injectors.

LS6Rally

iTrader: (14)

^ ahh makes sense. the amount of fuel consumed based off demand and duty cycle for the stock injectors.

Mindrot

iTrader: (1)

Absolutely 100% correct.

Area47

mpg is calculated off usec timing.

greenhorn

I'm confused, the computer calculator isn't right thought, its about 16 mpg off. When I calculate the mpg i get about 21-22 mpg but the DIC says I get 36-38mpg. So why would that mean im on stock injectors

Whitnith

iTrader: (2)

The computer thinks you are stock, no matter what. Once you change the injectors, it won't be right.

greenhorn

Ahhhh I see what happened there, He forgot the "t" in it.

TommyP

iTrader: (2)

whoops, damn cell phone typing. Sorry for the confusion

prevsrt4owner

Did that tune include an injector rescale?

prevsrt4owner

Bump, lol?

07MetallicSC

iTrader: (16)

How is this nws...

TommyP

iTrader: (2)

I think people use that because they literally only see the "!" in it.