Bad Gas Mileage!!! - Chevy Malibu Forum: Chevrolet Malibu Forums
Auto Insurance

» Featured Product
Wheel & Tire Center


ChevyMalibuForum.com is the premier Chevrolet Malibu Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 05-31-2012, 01:13 PM   #1
dowell69
CMF Rookie Member
2012 Malibu LTZ
Burgandy
 
Join Date: May 2012
Posts: 4
Gallery: 0
Post Bad Gas Mileage!!!

It there anyone actually getting the rated gas milage. I have the 2012 LTZ with 4cly and 6 sp auto. No matter how I drive down the Interstate I can only reach 28mpg, and thats on a good day. With most of my driving being interstates and some around town my average through a tank is only 23mpg. I took it to the dealer to have it checked and they say nothing is wrong and blame it on the 18" wheels and my tire pressure being 2 lbs off.

When I took it to the dealer they gave me another Malibu with same engine/trans. I was able to get 32mpg on the 20 mile trip home. They had no explanation but to say my car in operating normally. There has to be something I can do. Any help would be great.
dowell69 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-31-2012, 01:32 PM   #2
DrivenDaily
Administrator
2011 3.6/ A6 LTZ
Red Jewel Tintcoat
 
DrivenDaily's Avatar
 
Join Date: Dec 2009
Location: Kentucky
Posts: 9,868
Gallery: 6
Garage
Default Re: Bad Gas Mileage!!!

I have the V6 3.6. In daily driving I'm getting 18-20 and on the freeway I get anywhere from 23 to 29. One time I returned home (not in a hurry) 235 miles driving only 60 mph and got 36.4 mpg! Yes, that is calculated, not DIC.

Some of your mileage will be tire pressure if they're not up to 30 (or more like I usually keep mine). You can use the sticker on the door jamb and set them per GM, or experiment some but keeping them at or below the COLD max pressure (usually around 44 psi) to get better traction or mileage. Also, on a trip, if you're gonna carry additional load (people and/or luggage) you'll want to increase the psi accordingly.

The I4 usually gets great in-town mileage and even better freeway. Do you use cruise control? Do you fill up before a trip and then very shortly after? That is how to correctly measure your freeway mileage. Don't depend on the DIC to tell you. Some are pretty accurate and some are quite a ways off. My '09 V6 was almost dead on; my '11 V6 is always too high, sometimes several MPG.

Do you use the brakes while on the freeway? If so, you can instead tap off the CC (if used) or just let off the gas when you see traffic starting to cluster ahead. That way you're not converting kinetic energy (motion and speed) into thermal energy (heat from brake friction) and throwing it away.
__________________

'11 LTZ, born Aug 2010, Fairfax, KS

V6/A6, Red Jewel Tintcoat / Cocoa-Cashmere, Sunroof
Mods: WeatherTech mats, CHMSL Pulser

How-to: LEDs in mirrors :: How-to: 1-Wipe Wash
How-to: Remote express windows up/down


Traded: '09 2LT Black Granite Metallic V6 / A6 at 20,058 miles
Lost: '11 LTZ RJT V6 / A6 in flood at 44K miles
Muffler mod on '09
DrivenDaily is online now   Reply With Quote Quick reply to this message
Old 05-31-2012, 02:14 PM   #3
MalibuKen
Banned
2011 Malibu 1LT+
White
 
Join Date: May 2011
Location: Central Illinois/North Cent. Florida
Posts: 2,089
Gallery: 0
Default Re: Bad Gas Mileage!!!

Quote:
Originally Posted by dowell69 View Post
It there anyone actually getting the rated gas milage.

When I took it to the dealer they gave me another Malibu with same engine/trans. I was able to get 32mpg on the 20 mile trip home.

Yes, I get pretty much what the sticker says.....both for highway and city.....
BUT only if I can do a flat interstate with no headwind and not over 65 MPH.
Any deviation from that, like a few town miles over a couple of days or keeping up with the traffic at 75 and it nose-dives toward the city figure.

By paying attention, I can eek out 32 on the highway and about 23-24 in town.

Are your figures based on the DIC display or on actual calculations over several tankfuls ? While most owners report that the DIC is pretty close, yours might be off a bit; tires might be a factor in that. If that is true, you might not be able to trust your odometer either. Long shot though.

What is your average speed on the Interstate ?
MalibuKen is offline   Reply With Quote Quick reply to this message
Old 05-31-2012, 03:38 PM   #4
dowell69
CMF Rookie Member
2012 Malibu LTZ
Burgandy
 
Join Date: May 2012
Posts: 4
Gallery: 0
Post Re: Bad Gas Mileage!!!

I just turned 3000 miles and have been using both the DIC and my calculations
.
The last trip I took I reset everything and did 70 in the interstate (5 below speed limit) and only got 28
.
Tires have nitrogen and are set at 32.

I have been running the 10% ethanol fuel cause its cheaper. Going to Texas next week and I'm going to try running only regular fuel...maybe thats the difference.
dowell69 is offline   Reply With Quote Quick reply to this message
Old 05-31-2012, 04:24 PM   #5
MalibuKen
Banned
2011 Malibu 1LT+
White
 
Join Date: May 2011
Location: Central Illinois/North Cent. Florida
Posts: 2,089
Gallery: 0
Default Re: Bad Gas Mileage!!!

Quote:
Originally Posted by dowell69 View Post
The last trip I took I reset everything and did 70 in the interstate (5 below speed limit) and only got 28

I'm going to try running only regular fuel...maybe thats the difference.
What kind of terrain? Flat or hilly ?

The fuel is not the ONLY difference.....as E10 is all I can get around here, and most places that I go.

Did the 18" wheels come stock with the car?
If so, the story from the "mechanics" at the dealership stinks.

There have been times when I couldn't get 30 at 70 but not many.

I think maybe you have something amiss.
I also think you will probably have a terrible time making anybody at GM admit that.

Your "test drive" in another car is probably the best evidence you have so far.
Maybe you should talk to the agency OWNER and offer to trade him.

Good luck; I think you will be needing some.
MalibuKen is offline   Reply With Quote Quick reply to this message
Old 06-01-2012, 07:00 AM   #6
96MN12
CMF Junior Member
2008 Malibu 3.6 V6 LTZ
Black
 
Join Date: Aug 2011
Location: Queen Creek Arizona
Posts: 27
Gallery: 0
Smile Re: Bad Gas Mileage!!!

After 12K miles on a new engine, I recently took my 3.6 L 2008 LTZ back to the dealer for a check engine lite, crappy gas mileage and surging under moderate acceleration. Turns out that the CEL was caused by a "stressed" cable going to the purge valve. (Although the dealer wouldn't admit to it, was likely caused by the engine being pulled out twice - once to rebuild it due to high oil usage @ 47k miles - 2nd time to replace it with a new engine as the rebuild spun a rod bearing after 100 miles). They replaced the cable CEL turned off, but still crappy mileage. Over the course of a few thousand miles my mpg went from 24-25 mpg average mixed highway/city to 16-18. Dealer thought the poor mileage was due to the stressed cable and sent me on my way. Mileage was still bad. Not being a big fan of injector cleaning scams, Out of deparation, I reluctantly went to Autozone and bought a bottle of Lucas injector cleaner. I've had good experierence with other Lucas products, so thought I'd give it a try. Added it to a full tank. The surging improved almost immediately and after about half the tank, my gas mileage came back to 25-26 range (30-32 @ 70 MPH highway).

Last edited by 96MN12; 06-01-2012 at 07:04 AM. Reason: spelling
96MN12 is offline   Reply With Quote Quick reply to this message
Old 06-01-2012, 07:33 AM   #7
MalibuKen
Banned
2011 Malibu 1LT+
White
 
Join Date: May 2011
Location: Central Illinois/North Cent. Florida
Posts: 2,089
Gallery: 0
Default Re: Bad Gas Mileage!!!

Quote:
Originally Posted by 96MN12 View Post
I've had good experierence with other Lucas products, so thought I'd give it a try. Added it to a full tank. The surging improved almost immediately and after about half the tank, my gas mileage came back to 25-26 range (30-32 @ 70 MPH highway).
Others may find your experience useful.

I like Techron for routine use and Berrymans B12 Chemtool when there is an apparent problem but will give Lucas a look next time.
What was the exact product that you used ? (assuming that there might be more than one that claims to clean injectors).

I don't think it applies to HIS situation however, since he has no other symptoms (that he has mentioned anyway) and the engine is practically new.

No auto maker guarantees any particular gas mileage and it can vary from one to another just because of manufacturing tollerances. Getting poor mileage "fixed" when no other symptoms are present will be almost impossible, I think.

His dealer should at least hook up a scan tool and check all the parameters that they can.......while the car is going down the road too......and look for other obvious things, like dragging brakes or a slipping transmission due to low fluid. Just writing the complaint off with "we don't guarantee mileage" would not be an acceptable answer for me. If they really can't find anything, that might be different.
MalibuKen is offline   Reply With Quote Quick reply to this message
Old 06-01-2012, 08:56 AM   #8
96MN12
CMF Junior Member
2008 Malibu 3.6 V6 LTZ
Black
 
Join Date: Aug 2011
Location: Queen Creek Arizona
Posts: 27
Gallery: 0
Default Re: Bad Gas Mileage!!!

I agree that there are other products on the market but this one worked for me (so far).

Lucas Oil/5.25 oz. fuel injector cleaner
Autozone Part Number: 10020

I haven't been a big "believer" in injector cleaner since I suspect that caused the fuel pressure regulator on my 93 S10 Blazer (4.3 Vortec) to fail twice. Haven't used it since in the Blazer 140K miles later (230K total).

One of the things I liked about the Lucas injector cleaner is that it claims to not use any solvents.
96MN12 is offline   Reply With Quote Quick reply to this message
Old 06-01-2012, 12:08 PM   #9
MalibuKen
Banned
2011 Malibu 1LT+
White
 
Join Date: May 2011
Location: Central Illinois/North Cent. Florida
Posts: 2,089
Gallery: 0
Default Re: Bad Gas Mileage!!!

Quote:
Originally Posted by 96MN12 View Post
One of the things I liked about the Lucas injector cleaner is that it claims to not use any solvents.
The proof is in the pudding, so to speak, but I think that would tend to sway me the OTHER way.
MalibuKen is offline   Reply With Quote Quick reply to this message
Old 06-01-2012, 12:46 PM   #10
nutcrunch
CMF Veteran Member
 
nutcrunch's Avatar
 
Join Date: Jul 2009
Posts: 3,145
Gallery: 0
Garage
Default Re: Bad Gas Mileage!!!

Seafoam is excellent too. I never believed the hype nor really put much faith in any cleaner like that.
Now I admit I don't take care of the lawn mower at all. It is used to cut grass so why baby it? Anyways I always leave the gas in it year round, rarely clean the air filter, unless it won't even run and same with spark plugs.
Last summer the thing was running really crappy so I tried cleaning the air filter and putting in new plugs but it still ran crappy. I decided I'd give that Seafoam stuff I heard about a try since it was on sale at Autozone. I poured some in the gas tank and directly into the carb. It smoked a little then it started running great. I was really impressed.

Does anyone else use Seafoam?
__________________

2013 Malibu ECO 1SA PCN pkg
White Diamond Tricoat
50/35 tint
nutcrunch is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy Malibu Forum: Chevrolet Malibu Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
gas mileage micmak Problems/Service Issues/Troubleshooting (Generation 7) 24 01-20-2012 06:49 AM
What are YOU getting for mileage? cleatus General Discussion (Generation 7) 80 11-12-2011 09:44 PM
Gas mileage Hokiehall General Discussion (Generation 7) 52 03-02-2011 06:39 PM
Gas Mileage Duckybill General Discussion (Generation 7) 22 11-23-2009 06:57 PM
3.1 gas mileage cks General Discussion (Generation 7) 1 08-24-2008 05:05 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 09:03 PM.



Powered by vBulletin®. Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
The Chevy Malibu Logo, Chevy Malibu Typeface and Chevy Logo are Trademark General Motors. We are in no way affiliated with General Motors, we are simply an enthusiasts' site.