LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

Modded gxp gas mileage?

Thread Tools
 
Search this Thread
 
Old Feb 25, 2010 | 04:58 AM
  #1  
ak47man90's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Sep 2009
Posts: 59
Likes: 0
Default Modded gxp gas mileage?

I really like my folks gxp and have really been thinking of getting one but I don't want to get terrible mileage if I mod it. I get 25 highway with theres hand calculated. If I get one I'm thinking I would do exhaust, tune,and headers was just wondering what you guys get when you baby it, thanks.
Reply
Old Feb 25, 2010 | 05:44 AM
  #2  
94ss06gxp's Avatar
TECH Addict
iTrader: (5)
 
Joined: Aug 2009
Posts: 2,351
Likes: 0
From: Mid MI
Default

Originally Posted by ak47man90
I really like my folks gxp and have really been thinking of getting one but I don't want to get terrible mileage if I mod it. I get 25 highway with theres hand calculated. If I get one I'm thinking I would do exhaust, tune,and headers was just wondering what you guys get when you baby it, thanks.
I get about 180 to 200 miles on a tank right now and I don't get on it when my daughter is with me which I about 75-80 percent of the time, but when she's not with me I get on it once in a while. Don't get this car if ur worried about gas mileage. There is another thread I did a while back about gas mileage, use the search and it should give u some more opinions
Reply
Old Feb 25, 2010 | 01:53 PM
  #3  
LS1 Racing's Avatar
TECH Addict
20 Year Member
Photogenic
iTrader: (15)
 
Joined: Aug 2002
Posts: 2,419
Likes: 6
From: 78°14′46″N 15°27′56″E
Default

Headers are probably the only thing that will hurt mileage, and they're pretty much experimental and very expensive anyway.

I did get a tune to go along with my "modded exhaust" and CAI, and mileage stayed the same. I get about 26-28 on the highway, and don't do any city.
Reply
Old Feb 25, 2010 | 02:24 PM
  #4  
jlwcca's Avatar
Staging Lane
 
Joined: Oct 2009
Posts: 76
Likes: 0
Default

After the mods it seemed like my g-force computer was reading higher numbers then my fuel consumption computer.

I have a 4cyl sunfire for my "daily driver" however my gp is so much more fun and so much nicer to drive I usually say F*** mpg and take it out.

If you want mpg pick up a v6 or I4
If you want a decently quick boat pick up a gxp !
Reply
Old Feb 25, 2010 | 02:52 PM
  #5  
SigmaX6's Avatar
Launching!
 
Joined: Sep 2008
Posts: 238
Likes: 0
From: Canada
Default

I usually get 21-25 I do a highway to city drive each day and reverse on the way home.
Reply
Old Feb 25, 2010 | 03:54 PM
  #6  
ak47man90's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Sep 2009
Posts: 59
Likes: 0
Default

thanks guys yeah I would be happy with 25 highway I don't drive that much and want something fun
Reply
Old Feb 25, 2010 | 04:22 PM
  #7  
XFiveLiter's Avatar
TECH Resident
 
Joined: Feb 2002
Posts: 992
Likes: 0
From: Schererville, IN
Default

Originally Posted by 94ss06gxp
I get about 180 to 200 miles on a tank right now
Wow, That's terrible! Once I hit 180, I still have about a half tank left. Are you pulling a trailer?
Reply
Old Feb 25, 2010 | 08:49 PM
  #8  
Hawkins04's Avatar
TECH Fanatic
iTrader: (4)
 
Joined: Feb 2010
Posts: 1,467
Likes: 0
From: Lawrencevile, GA
Default

Im getting about 285-320 a tank (city rarely on the highway) depending on how i drive it. im getting the same now as i did with my supercharged V6 grand prix. both all stock other than cai.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Feb 25, 2010 | 09:24 PM
  #9  
EmersonHart13's Avatar
TECH Resident
iTrader: (3)
 
Joined: Jul 2007
Posts: 920
Likes: 0
Default

240ish almost all city. 25 mpg... I wouldn't count on it. Some of the mpg claims on here are from "factory freaks" and a good portion of the people will never see that. EPA claims 25 is the max on the highway which means that you will be lucky to see it as the EPA estimates are always optimistic.
Reply
Old Feb 26, 2010 | 08:23 AM
  #10  
94ss06gxp's Avatar
TECH Addict
iTrader: (5)
 
Joined: Aug 2009
Posts: 2,351
Likes: 0
From: Mid MI
Default

Originally Posted by XFiveLiter
Wow, That's terrible! Once I hit 180, I still have about a half tank left. Are you pulling a trailer?
LOL snowmobile trailer. I'm doing about 98 percent city driving and using my remote start religiously. And have some fun once in a while.
Reply
Old Feb 26, 2010 | 08:56 AM
  #11  
jlwcca's Avatar
Staging Lane
 
Joined: Oct 2009
Posts: 76
Likes: 0
Default

Originally Posted by EmersonHart13
240ish almost all city. 25 mpg... I wouldn't count on it. Some of the mpg claims on here are from "factory freaks" and a good portion of the people will never see that. EPA claims 25 is the max on the highway which means that you will be lucky to see it as the EPA estimates are always optimistic.
It really would depend on when I set the mpg computer... I guess I have been reseting after I get on the highway and to cruise just to see what mpg I get or maybe I have a factory freak too. (lol)
Reply
Old Feb 26, 2010 | 10:58 PM
  #12  
EmersonHart13's Avatar
TECH Resident
iTrader: (3)
 
Joined: Jul 2007
Posts: 920
Likes: 0
Default

There seem to be quite a few of them! My car is not one of them... lol
Reply




All times are GMT -5. The time now is 09:05 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE