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lets talk gas mileage

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Old Mar 7, 2011 | 11:26 PM
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Default lets talk gas mileage

i have a bone stock 08 gxp with k n drop in thats it.... i average 15.8 driving like a granny pretty much just wondering what mods can improve mileage the most ... ? with gas hitting 4 bucks a gallon soon its really gonna start to matter
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Old Mar 7, 2011 | 11:30 PM
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That's awful, I get 25-26 on the interstate (75 mph), 28-30 on highways (60), and 18-20 city and mixed driving...

I've got a K&N hot air intake, cat removed, only mufflers, electric cutout cracked, DoD removed, and a custom tune.
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Old Mar 7, 2011 | 11:45 PM
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Originally Posted by bigalnash
i have a bone stock 08 gxp with k n drop in thats it.... i average 15.8 driving like a granny pretty much just wondering what mods can improve mileage the most ... ? with gas hitting 4 bucks a gallon soon its really gonna start to matter
I've got similar mileage and it's been pissing me off for the longest time. I don't even have an intake.

Maybe it's 87 octane DiabLew tune time?
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Old Mar 8, 2011 | 07:33 AM
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is that 15.8 city or highway? or is that average? i average like 16 but i dont drive like a granny. winter gas sucks. kills fuel mileage.
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Old Mar 8, 2011 | 08:39 AM
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Get a catless downpipe and have the rear O2 sensor tuned out and the cat overtemp program turned off. I picked up, on average, 2-5 MPG, depending upon conditions.

I now have an 87 octane DiabLew tune, too. Didn't lose any mileage with that.

The next thing I want to do is experiment with taping off part of the grille a la NASCAR style to try to improve the aero.
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Old Mar 8, 2011 | 09:20 AM
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Originally Posted by LS1 Racing
The next thing I want to do is experiment with taping off part of the grille a la NASCAR style to try to improve the aero.
what do you mean taping off the grille? i average 15.7 and thats the average. I drive more city than highway though.
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Old Mar 8, 2011 | 09:53 AM
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Get Geo Metro. Problem solved.
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Old Mar 8, 2011 | 05:12 PM
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Originally Posted by TheMonteMan
is that 15.8 city or highway? or is that average? i average like 16 but i dont drive like a granny. winter gas sucks. kills fuel mileage.
winter gas... hopefully that what it is, ya thats highway and city average
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Old Mar 8, 2011 | 05:22 PM
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I average 18.2, and 90% of that is Highway. Every time I reset it gets lower and lower. When I first got the car, I was averaging 24 MPG (mostly city), and now I average roughly 18 (mostly highway). I think I just need a good tune, but right now I can't afford it.

On a side note, for some reason lately I've been getting poor throttle response. I suspect my cutout has something to do with it, because it's been progressively getting worse since I put it on. Maybe the cutout has something to do with poor gas mileage/throttle response ?????????
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Old Mar 8, 2011 | 05:54 PM
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The cutout just makes you want to get into the throttle more.

My fuel eco didn't change when I got my cutout.
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Old Mar 8, 2011 | 06:56 PM
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Originally Posted by SSCoop
what do you mean taping off the grille?
I'll be taking some black vinyl tape and closing off some of the airflow through the grilles, so that it's redirected around the car. Since our car is driven mostly at 60 MPH+, this should yield an improvement in gas mileage.

It will take some experimenting, though, because if you close off too much, it will run too hot.
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Old Mar 8, 2011 | 08:34 PM
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I was averaging about 30 MPG on a recent trip from the Chicago area to Atlanta. I don't drive fast, just the speed limit which was 70 about 90% of the trip. Car is absolutely bone stock.
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Old Mar 8, 2011 | 08:38 PM
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I was getting about 24 mpg with 60% highway until I disabled dod for a Lew tune... then it dropped about 2 mpg....I DON'T granny mine either
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Old Mar 8, 2011 | 09:07 PM
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I drive like heavy footed but don't speed. I average between 15 and 16 City. Just drove to indy did not speed either got 23.5. Over half of that was 60 mph and some of it was 70. Ahh well car goes into storage at the end of this month!
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Old Mar 8, 2011 | 09:27 PM
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I'm averaging 220 a tank hoping for some improvements after a tune up and a tune
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Old Mar 8, 2011 | 09:31 PM
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18 mpg average here
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Old Mar 8, 2011 | 09:55 PM
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Originally Posted by Battle_Ravage
That's awful, I get 25-26 on the interstate (75 mph), 28-30 on highways (60), and 18-20 city and mixed driving...

I've got a K&N hot air intake, cat removed, only mufflers, electric cutout cracked, DoD removed, and a custom tune.
I get almost identical numbers for my long trips. between 70-74 mph I'm at 30 or in the upper 20's.

However around town just sucks *****. I get like 14-15 in stop and go city commuting.
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Old Mar 8, 2011 | 10:11 PM
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Originally Posted by LS1 Racing
I'll be taking some black vinyl tape and closing off some of the airflow through the grilles, so that it's redirected around the car. Since our car is driven mostly at 60 MPH+, this should yield an improvement in gas mileage.

It will take some experimenting, though, because if you close off too much, it will run too hot.
The coefficient of drag on the Imp is around 34 - 35, its an aero pig, MCSS was one less.
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Old Mar 9, 2011 | 11:58 AM
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I believe I'm sitting at 14.5 MPG currently. I'm mostly city driving. I desperately want a tune, but I don't have the money for one. I want to get that number up. Even 18 would be great.
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Old Mar 10, 2011 | 11:48 AM
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lol, how many MPG threads do we have now?

What have we learned... RECAP:

Some people get 75 (exaggeration) mpg - because they can't add or only drive downhill
Some get 10 - because they drive the car like they are supposed to

Everyone gets somewhere in the middle - Because that is how it works.

If you are worried about MPGs go buy a ******* Prius, Civic, Focus, Cruze, aka something with a 4 banger not a V8!
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