My Gas Mileage - Jeep Commander Forums: Jeep Commander Forum
General Commander Discussion General Discussion involving the Jeep Commander goes here. If it does not fit into a more specific category below, post it here.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 54 (permalink) Old 05-09-2011, 10:44 AM Thread Starter
Junior Member
Points: 354, Level: 7 Points: 354, Level: 7 Points: 354, Level: 7
Level up: 8% Level up: 8% Level up: 8%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2010
Posts: 7
My Gas Mileage

note: Im aware the gas mileage on my vehicle is horrible and knew that before buying it, and I accept it.

08 5.7 Hemi, 17k miles

I'm currently getting 9.5 to 10.5 mpg with 90/10 city/highway mix. Close to all city for the most part with the occasional 20 minute jaunt out to the suburban malls. That "fuel saver" mode is activated and I occasionally see it blink on...I can't imagine it does much and may even experiment turning it off.

Is this about right? 9.5-10.5? I cant find what the city rating is. I've had a dealer oil change service less than 1,000 miles ago fwiw.

If this is not right (and I could only imaging it wrong on the low side) what might I look at? There are no mods.

meegwell
meegwell is offline  
Sponsored Links
Advertisement
 
post #2 of 54 (permalink) Old 05-09-2011, 10:55 AM
Senior Member
Points: 1,855, Level: 25 Points: 1,855, Level: 25 Points: 1,855, Level: 25
Level up: 55% Level up: 55% Level up: 55%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Aug 2010
Location: Oxnard, CA
Posts: 117
That is about all I ever get driving around in the city with my 07 hemi. I'd say nothing to worry about other than your wallet.
hoaxci5 is offline  
post #3 of 54 (permalink) Old 05-09-2011, 11:29 AM
Senior Member
Points: 15,906, Level: 81 Points: 15,906, Level: 81 Points: 15,906, Level: 81
Level up: 12% Level up: 12% Level up: 12%
Activity: 0% Activity: 0% Activity: 0%
 
Mongo's Avatar
 
Join Date: Oct 2010
Location: Lusby, MD
Posts: 3,037
Look for any stored fault codes, make sure you are up to date with preventative maintenance and correct any problems you find with the vehicle. (Spark Plugs and Air Filter are big ones that effect mileage, @17k, your spark plugs should be good, but if you haven't changed the air filter, it could be hurting mileage if its dirty.)

Other than changing your driving style to be more fuel consience, which can be very hard to do in city traffic, that is about all you can do practically.

I guess the Dealer has coupons and cut rates for oil changes to make it economical, usually the dealers charge way to much for other jobs that are NOT worthwhile, which is really frustrating that Chrysler just happens to design the vehicle with proprietary locks that force you to bring the vehicle to the dealer for many repairs.

Personally, I change my own oil, you can use much better synthetic oil and filters for the same cost. Synthetic is arguably overkill, and if you're NOT going to keep the vehicle over 120k miles, that is a good point. If you're going to pay someone else to do all the maintenance and repairs, its usually NOT cost practical to maintain the vehicle to a level to last that it lasts much longer and just get a new vehicle after 120k miles.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Mongo; 05-09-2011 at 11:34 AM.
Mongo is offline  
 
post #4 of 54 (permalink) Old 05-09-2011, 11:40 AM
Senior Member
Points: 8,101, Level: 60 Points: 8,101, Level: 60 Points: 8,101, Level: 60
Level up: 76% Level up: 76% Level up: 76%
Activity: 0% Activity: 0% Activity: 0%
 
Matt_'s Avatar
 
Join Date: Jun 2010
Location: NJ
Posts: 1,128
Remember, plugs are due every 30k miles OR 3 years, whichever comes first. Stop & Go and idling of city driving takes its toll.... 17-20k city miles are just as bad, if not worse than 30k of highway mileage.

I'd consider a fresh set of plugs and pcv valve (also due every 30k). It sure couldn't hurt, and technically its due.

-Matt
Matt_ is offline  
post #5 of 54 (permalink) Old 05-09-2011, 12:16 PM
Senior Member
Points: 3,619, Level: 37 Points: 3,619, Level: 37 Points: 3,619, Level: 37
Level up: 80% Level up: 80% Level up: 80%
Activity: 0% Activity: 0% Activity: 0%
 
superacerc's Avatar
 
Join Date: Nov 2009
Location: Juneau, ak
Posts: 275
lol, this thread started out like an AA meeting. "Im aware the gas mileage on my vehicle is horrible and knew that before buying it, and I accept it."

Hi. My name is Ryan. I'm an XK owner and I know It drinks too much.

Mods: 2007 Commander 4.7L, QTII, OEM Towing Option, front tow hooks, 2.25" lift, rusty's 1/4" leveling spacer, Bilstein 5150 Rear Shocks, rear swaybars disconnected, 4xguard front skid plate, mopar steel engine skid, Defender Roof Rack, 265/70/R17 BFG KM2 M/Ts 1.5" wheel spacers from rough country ($59.99) , Yaesu FTm350 70 cm, 2meter 220 50 watt mobile radio , 5db gain mag mount antenna, Hella 500FF lights.
_____________________________________________
Garage:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
superacerc is offline  
post #6 of 54 (permalink) Old 05-09-2011, 12:18 PM
Super Moderator
Points: 59,465, Level: 100 Points: 59,465, Level: 100 Points: 59,465, Level: 100
Level up: 0% Level up: 0% Level up: 0%
Activity: 66% Activity: 66% Activity: 66%
 
jeep5253's Avatar
 
Join Date: Jun 2006
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Posts: 14,894
If you are using premium gasoline, don't. The Owner's Manual says not to use it. 89 octane gas is recommended, with 87 octane being acceptable.

2006 Steel Blue 5.7L HEMI Limited 4x4 Build Date: June 9, 2006 Hour 14
Interior: Dark Slate/Light Graystone with Saddle Brown Leather Seats
Quadra-Drive II, NAV, DVD, Trailer Tow Group IV, Off-Road Group II, Remote Start, UConnect, Rear Backup Camera, Chrome Wheels,
Magnaflow cat-back exhaust, Daytime Running Lights enabled, 2" Rough Country Lift with 265/70R17 Goodyear Wrangler AT/S
jeep5253 is offline  
post #7 of 54 (permalink) Old 05-09-2011, 12:39 PM
Senior Member
Points: 15,906, Level: 81 Points: 15,906, Level: 81 Points: 15,906, Level: 81
Level up: 12% Level up: 12% Level up: 12%
Activity: 0% Activity: 0% Activity: 0%
 
Mongo's Avatar
 
Join Date: Oct 2010
Location: Lusby, MD
Posts: 3,037
Quote:
Originally Posted by Matt_ View Post
Remember, plugs are due every 30k miles OR 3 years, whichever comes first. Stop & Go and idling of city driving takes its toll.... 17-20k city miles are just as bad, if not worse than 30k of highway mileage.
I think you can make a case that 20k miles of city driving is more like 60k miles of highway. Because its the cold starts and warm-up that are toughest on the motor, and oil, people typical travel 4 or 5 times as far between start-ups on highway miles than city miles, and the time spent, stop and go, braking, accellerating and sitting idling the motor count as well.

Quote:
Originally Posted by jeep5253
If you are using premium gasoline, don't. The Owner's Manual says not to use it. 89 octane gas is recommended, with 87 octane being acceptable.
Yes, higher than needed octane gasoline gets you absolutely nothing, except wasting money. Unless there is something wrong with your vehicle or you modified the motor extremely, or live an extriodinarily hotter and denser air environment than the designers ever envisioned (like Death Valley or Kuwait in Summer), the recommend Octane is more than enough.

People have shown lower octane gets better mileage, my guess, the lower volatility allows better atomization and more efficient burning.

The only way lower Octane is bad, is if you get spark knock, actual detonation, which is really bad for the motor and can damage it, that should NOT happen if you're using recommended octane. The Engine Controller has a safety feature to recognize the spark knock and/or detonation, and retarnd ignition timing to stop it. BUT, retarding ignition timing kills power and power for the amount of fuel burned, resulting in mileage dropping.

So, if your Owner's manual says to use 89 Octane, with 87 Octane being acceptable. That tells me, 89 is best, but the motor will NOT suffer damage if you use 87 octane. I'd measure mileage for both octanes, I would NOT be surprised if the controller has to retard the ignition often for 87 octane, resulting in worse mileage, if it does NOT, which it wouldn't for colder temperatures or higher altitudes, then 87 octane might provide better mileage. Eitherway, measure it and go with the Octane that produces the best for the conditions, don't use octanes outside of what is recommended or acceptable, it can damage the engine. Too high octane, NOT very likely to do any damage, but if it changes anything it will make mileage and cold starting worse, so your just wasting money for worse performance with higher than recomended octane.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Mongo is offline  
post #8 of 54 (permalink) Old 05-09-2011, 12:41 PM Thread Starter
Junior Member
Points: 354, Level: 7 Points: 354, Level: 7 Points: 354, Level: 7
Level up: 8% Level up: 8% Level up: 8%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2010
Posts: 7
thanks for the input all. My name is Meegwell, and its been about 15 minutes since I last filled up.


Yeah - I justed wanted to make sure that was about right and it should not be something higher like a whopping 11. Wow, 11 mpg, that would be sweet.

So at 40k up front and 40 cents a mile, maybe I shouldn just be taking a cab around town? haha...

My dog loves the commander.


meegwell
meegwell is offline  
post #9 of 54 (permalink) Old 05-09-2011, 12:43 PM
Senior Member
Points: 15,906, Level: 81 Points: 15,906, Level: 81 Points: 15,906, Level: 81
Level up: 12% Level up: 12% Level up: 12%
Activity: 0% Activity: 0% Activity: 0%
 
Mongo's Avatar
 
Join Date: Oct 2010
Location: Lusby, MD
Posts: 3,037
Yea, my 1969 Charger with a 440 gets about the same mileage.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Mongo is offline  
post #10 of 54 (permalink) Old 05-09-2011, 12:47 PM
Senior Member
Points: 8,101, Level: 60 Points: 8,101, Level: 60 Points: 8,101, Level: 60
Level up: 76% Level up: 76% Level up: 76%
Activity: 0% Activity: 0% Activity: 0%
 
Matt_'s Avatar
 
Join Date: Jun 2010
Location: NJ
Posts: 1,128
I did an extensive mileage test. For my 5.7L and my driving, 91 yielded horrible gas mileage (even when properly tuned for it), 87 was better, but not by much. I get the best MPG and performance running 89 per the manual. (just my experience.... results may vary)

-Matt
Matt_ is offline  
Sponsored Links
Advertisement
 
Reply

  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > General Commander Discussion

Tags
fuel mileage , mpg

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Jeep Commander Forums: Jeep Commander Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome