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Old 12-05-2008, 09:41 AM
  #21  
XKR
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Originally Posted by Cannysage
that sounds about where I am, except I no long seem to be in the 20s on the freeway going 75mph ish
I never changed my driving habbit in any way and in declined a bit, without any configuration change.. not a big thing.. just thought it was a bit odd.

If you dont smell gas you are good....How old are your plugs? After I started changing mine often....it got a little better.
Old 12-05-2008, 09:48 AM
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Originally Posted by Cannysage
that sounds about where I am, except I no long seem to be in the 20s on the freeway going 75mph ish
I never changed my driving habbit in any way and in declined a bit, without any configuration change.. not a big thing.. just thought it was a bit odd.
You sure it isn't just the season? Colder air, winter gas, etc. Assuming that this just started fairly recently.
Old 12-05-2008, 10:08 AM
  #23  
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Originally Posted by VQdriver
interesting....sounds really oldschool that it goes beyond hype lol. can these substances damage fuel system components? http://www.caranddriver.com/reviews/...rs+page-3.html
Similar to running a little meth....... octane booster and leaves components cleaner, correct? I'm not sure about the mileage though.
Old 12-05-2008, 10:19 AM
  #24  
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Originally Posted by XKR
If you dont smell gas you are good....How old are your plugs? After I started changing mine often....it got a little better.
Gas fume is strong as hell.. but the A/F is in the correct range (15ish@ idle and 11ish@WOT). Everything's new.


Originally Posted by My350P
You sure it isn't just the season? Colder air, winter gas, etc. Assuming that this just started fairly recently.
nah... I actually noticed this on the first build (i hate saying that ). right after a tune, it was getting about 20mpg on average and declined after a few thousand miles.
Old 12-05-2008, 11:14 AM
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Originally Posted by Cannysage
Gas fume is strong as hell.. but the A/F is in the correct range (15ish@ idle and 11ish@WOT). Everything's new.




nah... I actually noticed this on the first build (i hate saying that ). right after a tune, it was getting about 20mpg on average and declined after a few thousand miles.
Are you smelling gas fumes or exhaust fumes make sure those plugs are good !!
Old 12-05-2008, 11:19 AM
  #26  
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Originally Posted by XKR
Are you smelling gas fumes or exhaust fumes make sure those plugs are good !!
well, exhaust fumes..

I'm going to mix some 100oct...
Old 12-05-2008, 12:22 PM
  #27  
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22mpg now that it's cooler out...
Old 12-05-2008, 01:12 PM
  #28  
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I run high 15s to low 16s cruise and idle and cruising 75-80 on the highway I get 28-29mpg. Under boost and high 10s A/F I get under 10mpg.

Leaning out the cruise/idle does fantastic things for gas mileage as long as you don't lean it out too much...then it will stumble all over itself.
Old 12-05-2008, 01:20 PM
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Originally Posted by Alberto
24mpg for me driving back from Forged, NO boost at all (GF in the car-she is scared of wheelspin lol)

As low as 10-11mpg when driving it my way
About the same for me with no boost, I can't even think of what it is when I am boosting. I just know I fill up about three times a week. Lol at the gf comment, my wife hates boost.
Old 12-05-2008, 04:26 PM
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How are you guys calculating your MPG? I don't think the MPG on the factory nav is that accurate. I means I am S/C and it says 19-20 on the street, and when crusing on the highway in 6th gear, it says 35-45. I know that can't be right...
Old 12-05-2008, 04:35 PM
  #31  
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Originally Posted by jonnylaw
How are you guys calculating your MPG? I don't think the MPG on the factory nav is that accurate. I means I am S/C and it says 19-20 on the street, and when crusing on the highway in 6th gear, it says 35-45. I know that can't be right...
bigger injectors wacks out your MPG gauge.. i calculate mine by miles traveled, divided by the gallon filled.
Old 12-05-2008, 05:17 PM
  #32  
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Originally Posted by Cannysage
i calculate mine by miles traveled, divided by the gallon filled.
+1 that's how I've always calculated it. The computers are typically off a bit anyway.
Old 12-05-2008, 05:20 PM
  #33  
doug
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Originally Posted by BriGuyMax
I run high 15s to low 16s
no no.. not your 1/4 mile times.. your MPG
Old 12-05-2008, 08:31 PM
  #34  
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mine is miles driven/gallons used.

The mpg gauge on the g's nav screen is just a vacuum gauge essentially that does a small calculation....so when you go into boost it goes off the chart highest mpg you can get lol....I'll get a vid one day. Its funny too watch..oh 100% throttle is 40+MPG LOL
Old 12-05-2008, 09:04 PM
  #35  
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if nothing has changed such as fuel,tune,habits,you should leak down the motor and start looking for the cause to your loss in efficiency.(one tire low on air is enough to give your symptoms).parasitic loss in a failing tranny or diff can also contibute.if your state switchs to winter blend fuel that is enough as well.you should find what has changed,before it finds you.
Old 12-06-2008, 05:52 AM
  #36  
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Originally Posted by doug
no no.. not your 1/4 mile times.. your MPG
Don't be jealous
Old 12-06-2008, 09:22 AM
  #37  
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All highway driving I get around 25-26mpg, in the city I get ~17mpg. It's expected

...and FWIW my g/f LOVES boost, but it's still funny to watch her scramble for an "oh shít handle" when I hit boost
Old 12-06-2008, 01:18 PM
  #38  
j.arnaldo
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Stock 'O4 Touring Coupe: 19 MPG in city; 26, freeway. FLAWLESS AT, NO feathering,
NO oil-consumption issues, NO PAIN, NO PROBLEMO!!!
Old 12-06-2008, 01:42 PM
  #39  
Cannysage
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Originally Posted by j.arnaldo
Stock 'O4 Touring Coupe: 19 MPG in city; 26, freeway. FLAWLESS AT, NO feathering,
NO oil-consumption issues, NO PAIN, NO PROBLEMO!!!
this is the FI section
Old 12-06-2008, 05:30 PM
  #40  
Dynasty.Zero
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Originally Posted by j.arnaldo
Stock 'O4 Touring Coupe: 19 MPG in city; 26, freeway. FLAWLESS AT, NO feathering,
NO oil-consumption issues, NO PAIN, NO PROBLEMO!!!
Wrong section darling.
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