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-   Fuel Economy - Hypermiling (https://www.cobaltss.net/forums/fuel-economy-hypermiling-165/)
-   -   Mileage problems (https://www.cobaltss.net/forums/fuel-economy-hypermiling-165/mileage-problems-290482/)

greenhorn Dec 5, 2012 04:33 PM
Mileage problems
 
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 Dec 5, 2012 04:35 PM
what are you expecting to get haha. 265 miles per tank sounds about right.

greenhorn Dec 5, 2012 04:40 PM
Originally Posted by BPacak (Post 6826106)
what are you expecting to get haha. 265 miles per tank sounds about right.
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 Dec 5, 2012 04:41 PM
when do you reset it?

greenhorn Dec 5, 2012 04:42 PM
Originally Posted by BPacak (Post 6826115)
when do you reset it?
Every time that I refill, the MPG usually shoots up to 36 immediately and just stays there the whole tank.

TommyP Dec 5, 2012 04:50 PM
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 Dec 5, 2012 05:32 PM
^ ahh makes sense. the amount of fuel consumed based off demand and duty cycle for the stock injectors.

Mindrot Dec 5, 2012 05:39 PM
Originally Posted by TommyP (Post 6826132)
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.
Absolutely 100% correct.

Area47 Dec 5, 2012 05:45 PM
mpg is calculated off usec timing.

greenhorn Dec 5, 2012 09:37 PM
Originally Posted by TommyP (Post 6826132)
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.

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 Dec 5, 2012 09:42 PM
Originally Posted by greenhorn (Post 6826634)
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
The computer thinks you are stock, no matter what. Once you change the injectors, it won't be right.

greenhorn Dec 5, 2012 09:45 PM
Originally Posted by Whitnith (Post 6826641)
The computer thinks you are stock, no matter what. Once you change the injectors, it won't be right.
Ahhhh I see what happened there, He forgot the "t" in it.

Originally Posted by TommyP (Post 6826132)
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.

TommyP Dec 6, 2012 08:26 AM
Originally Posted by greenhorn (Post 6826650)
Ahhhh I see what happened there, He forgot the "t" in it.
whoops, damn cell phone typing. Sorry for the confusion

prevsrt4owner Dec 6, 2012 08:50 AM
Did that tune include an injector rescale?

prevsrt4owner Dec 31, 2012 11:08 AM
Bump, lol?

07MetallicSC Dec 31, 2012 05:43 PM
How is this nws...

TommyP Dec 31, 2012 05:46 PM
Originally Posted by 07MetallicSC (Post 6861073)
How is this nws...
I think people use that because they literally only see the "!" in it.


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