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post #1 of 12 (permalink) Old 07-13-2011, 11:07 AM Thread Starter
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Question Gas Milage????/

We just bought a 2010 with the v-6 and 2 wheel drive and just checked the gas milage. It is getting 18MPG on combined town and highway driving. Does this seem about right, I was just thinking it would have done better. What are the rest of you getting with the v-6? Thanks Ronnie
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post #2 of 12 (permalink) Old 07-13-2011, 11:47 AM
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see this thread---> https://www.jeepcommander.com/forums/showthread.php?t=1037&highlight=mileage&page=5

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post #3 of 12 (permalink) Old 07-13-2011, 02:14 PM
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thats what I've been getting with the 4.7 V8


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LET'S ALL GET TANKED AND GO DIVING
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post #4 of 12 (permalink) Old 07-14-2011, 02:13 AM
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I get roughly 21 mpg combined city driving alone i get 18mpg but when i reset it when i get on the e-way i get 27-29 mpg at a steady 80 mph

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post #5 of 12 (permalink) Old 07-14-2011, 02:15 AM
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But also know unless im playing i also rock the tires to 45 psi

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post #6 of 12 (permalink) Old 07-18-2011, 07:00 AM
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Check the curb weight of the vehicle, and just look at the profile to deduce the aerodynamic drag at higher speeds.

The biggest factor on mileage is driver habits.

The engines are far more efficient than they were in the past, that is why you see bigger V8's making pretty darn close to the same mileage as smaller V6's. The weight and aerodynamics is why you get poor mileage.

18MPG doesn't sound too bad, most V6 Commander owners get about that, less with more in town driving.

A V6 usually gets a MPG or two more then the V8, someone posted they are getting the same with their 4.7L V8, I suspect different driver habits is what erases that slight difference between the two of you.

Quote:
Originally Posted by allwayz_thinkin0806 View Post
I get roughly 21 mpg combined city driving alone i get 18mpg but when i reset it when i get on the e-way i get 27-29 mpg at a steady 80 mph
Wow, best I've done is 25MPG holding a steady 50mph, start and stop measuring once I reached the steady 50mph, doing 80mph drops me to 16mpg or less. I've got the 3.7L also, something has to account for that big of a difference do you have different sized tires?

BTW, 44PSI is the max rec press for the OEM tires, yea, 1PSI over is going to do anything, if you've got different tires, check the sidewall, 35PSI is common for a lot of tires, and being 10PSI over is possible to to cause a problem. Yea, pressure to low is what really causes the problems. Too high of pressure bursting a tire is rare, but HOT roads, on a HOT day in a heavy vehicle with lots of high speed driving, it could happen.


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Last edited by Mongo; 07-18-2011 at 07:10 AM.
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post #7 of 12 (permalink) Old 07-18-2011, 03:51 PM Thread Starter
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Gas Miliage

Ours has the tires that came on it and they are are all at 38# maybe I need to go a little more with them. On the highway I run 65-70. I just put a new air filter in it but i have a KnN that i should put in it. We have a 2010 Challenger RT and the 5.7 gets a lot better than this. Ronnie
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post #8 of 12 (permalink) Old 07-18-2011, 04:27 PM
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I just went on a camping trip and ran 89 octane averaging about 75-80mph for 150 miles and according to the computer I got 18.2. Was just below half a tank and filled up with 87 and on the way home the mpg went down to 17.9 averaging about 70mph. Seemed weird to me, but I definitely liked the mileage. Also, I've got the Hemi.

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post #9 of 12 (permalink) Old 07-18-2011, 04:33 PM
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Over inflated tires not only provide a very rough ride for the passers, this also equates to increased wear & tear on the suspension. When combined with the increased center tread wear.. you're really not saving much with the minimal MPG improvement you may get.

More importantly, any MPG improvement you do see is due to the decreased contact patch with the road. Can anyone guess what this translates to? Less traction, longer stopping distances and decreased emergency maneuverability.

Run a few PSI over if it makes you happy... but 10 PSI over the recommended pressure is not a bright idea. Especially with a vehicle as top heavy and large as an XK, i would strongly advise against running high pressures in the tires. The costs far outweight the benefits IMO.

-Matt
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post #10 of 12 (permalink) Old 07-19-2011, 03:59 PM Thread Starter
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Gas Milage

OK, I will leave the tire pressure where it is and change the air filter The [email protected] is suppose to help on the milage so I'll try that since i all ready have it. It is the same filter that fits the new Challengers. I'm not going to put a CAI on just going to use the factory set up. I'll see what it does. Ronnie
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