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I'm contemplating buying a 4x4 Commander and wondering if I should get the V6 for MPG reasons. And knowledgeable opinions on this? "V6 is underpowered," etc?
 

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If you are buying for mpg. then it doesn't matter as they all get close to the same, the Commander is a heavy vehicle and that being said it takes more for the V-6 to move it down the road then the V-8. So I feel that you should look at different reasons before you purchase, what is it's main job? what is it's second job? and go from there.


Welcome either way,

Swanny
 

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They all get about the same MPG - its the shape of the Commander - a brick and high wind resistance.
Get the HEMI if you can I have achieved 21 MPG with a tail wind. The MDS system helps by shutting off 2 cylinders under light load. Around town they all get 14 or less.
But the HEMI also holds 7 quarts of oil and 16 spark plugs which can add up:)
 

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I'm contemplating buying a 4x4 Commander and wondering if I should get the V6 for MPG reasons. And knowledgeable opinions on this? "V6 is underpowered," etc?
I made that mistake back in early 2011 when I bought a 3.7L Grand Cherokee Laredo Rocky Mountain Edition thinking that the V-6 would be better on Gas than a V-8.

That logic does not apply to Jeep Power trains.

You will NOT get noticeably better MPG's buying a V-6 instead of a V-8.

The difference in gas mileage is negligible.

My Grand Cherokee was under-powered; a Commander is larger and heavier.

In my opinion, based on my 2008 Grand Cherokee 3.7L experience, a Commander with a V-6 (3.7L) would be grossly under-powered, but, there are people on this forum that have them and are very happy with them, so obviously, not everyone agrees with me.

I guess it just depends on what you are used to.
 

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As stated the mpg is about the same either way.
You should drive both the v6 & v8 model to see which feels better to you.
The v6 is not bad but never drove the v8 either. IMO the 3.7 would be better in smaller vehicles, however I have yet to notice any real lack of power when driving around town, fast enough on the hwy too. My opinion is based on real gutless vehicle I've driven that couldn't handle the mass it was pushing. Would a v8 be better for the tonnage? probably.

IMHO 3.7 & 4.7 are good motors if they been maintained, that's the biggest worry i would have.


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The 08+ 4.7l in factory form is pretty similar to a stock early 5.7l as far as power and mpg is concerned. Keep that in mind during your search.

I have the v6. MPG is not noticeably better than the v8 guys, and it is definitely comparatively underpowered. I wanted one of the v8 options, but the wife wanted this one and she wanted it now.
 

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Being underpowered is subjective, the 3.7L V6 makes as much power as small block V8's of only a few years ago, the Drive-by-Wire computer controlled throttle is probably more responsible for people complaining, "it ain't got the get up and go I want"....but there are a few points that make the V8 a better deal.

The V6's almost always came with QTI 4X4, which doesn't have a 4LOW nor the ability to switch the XFR Case into neutral. A few did come with QTII, but what are the chances you're going to find one of those in the used market.

The 4.7L V8 mostly came with QTII, which can shift into 4LOW, locking the XFR case and shift the XFR case into neutral, something you need for towing behind an RV or serious off-roading.


Some of the HEMI V8's came with the QDII that can do everything that the QTII can do, plus has electronic LSD's in both front and rear axle, that provide even more serious off-roading ability.

The simpler 4X4 systems are still plenty capable off road, and less complex and have less trouble. The QTI doesn't have the N23, Service 4WD system that you see a lot posts about.


But if you want to do be able to do true mudding, you need the 4LOW of the QTII or QDII systems, and QDII with the ELSD's is even better. You'll have to change axle fluid more often and will have more things to break. The V8 power when mudding is more than a small advantage.


Like mentioned, the gas mileage difference is negligible, the V8's are so efficient now, its really doesn't make much of a difference. The V6's were popular because of the price, the difference in cost for V6 vs a HEMI made a significant difference in the selling price, and might make for a difference used car prices as well.

Oh BTW, the MDS of the Hemi shuts down 4 of the 8 cylinders, NOT just 2.

Oh yea, room to work on the engine, sorry, the modern crash protection standards puts so much extra metal, bigger frame rails and extra frame pieces in the front of the car, even the V6 is crowded as all get out and a total PITA to fit your hands into places to work on it, the V8's are even worse.
 

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Having taken a 3.7 out I can attest it is tightly packed in. 4.7 is only 2 more cylinders, not enough to change much IMO.

Trying to take valve cover off with the motor just about bare about ready to pull out was still a struggle. The smaller KJs are easier to do this maintenance.you'd think it'd be the XK that is easier to work on.

Biggest strike against newer engine bays is any maintenance takes ten extra step because the motor and transmission are assembled then installed from the bottom into the frame of the jeep. Some bolts are almost inaccessible.

I would agree a v8 is a better fit for the XK, yet the v6 is not the pathetic slouch I'd expect. But ours also has the old fashion throttlebody, maybe that makes all the difference


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Biggest strike against newer engine bays is any maintenance takes ten extra step because the motor and transmission are assembled then installed from the bottom into the frame of the jeep. Some bolts are almost inaccessible.
They built cars like that since the 60's, maybe even the 50's.


But you're still right, in the past they designed it well enough the bolts were still accessible and there was still room to do the various maintenance and repair jobs without having to pull out a dozen components first just to get to the one component that needs changed.



I think its mostly all the government requirements hoisted on the car companies.
  • Gov wants the vehicles to be more crash resistant which makes them bigger and heavier.
  • Gov want the vehicles to be smaller and lighter.
  • Gov want the vehicles to make less pollution, which makes them less fuel efficient.
  • Gov want the vehicles to get better mileage.
  • Consumers choices form the market, so consumers NOT knowing NOR caring about these contradictions, nor ease of maintenance for a vehicle lets the manufacturer continue down this trend.
So there is a lot of pressures on the designers to squeeze things together more to meet all the standards. And to add lots of extra equipment in tight spaces to meet all the standards as well.



So I do have some sympathy before bad mouthing the designers.


But, I think we both agree, there are times working on the newer cars you scratch your head and have to say, did the designers ever take into account that this part would have to be removed and replaced one day? Or did they just assume the entire drivetrain and subframe would be separated and lowered from the body, in reverse of what they do on the assembly line, to service the part?
 

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So true. Easy to blame the designers when the government is placing the hurtles in front of them.
I figure a lot of the designed make perfect sense on a computer screen, and less so in reality.

The late 90's s10/Sonoma with a 4cy there is almost no way to remove or access some of the bolts. Adding dozens of hours to the job.

Jeep on the other hand while some bolts were a pita to access and to get the intake out the engine mounts need to be unbolted and engine lowered, is not that bad a job.
Honestly I'd pull and replace another commander motor, it's a big job but not that bad. IMHO

I figure the 3.7&4.7 ought to be nearly the same job. Not idea how different the 5.7 is.

Anyway. On topic I guess the moral is get a v8 to play it safe ;)


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