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  #37  
Old 07-24-2011, 04:03 AM
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Re: Towing and fuel economy 3.6L not acceptable

According to the specs in my brochure, the V6 Petrol and the diesel both run the Mercedes W5A580 transmission (no tow haul feature) and the Hemi runs the 545RFE trans with the tow haul feature.

In our previous 2008 WK overland diesel, I got our local service department to alter the shift protocol to make it change down a little earlier when towing our 2500kg caravan. It certainly cut down on the manual shifting !! Roll on the introduction of the new 8 speed ZF box due late 2012 - early 2013.

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Cheers Chris
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  #38  
Old 07-24-2011, 05:04 PM
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Re: Towing and fuel economy 3.6L not acceptable

Marlin,

What was your MPG towing the 5000 lbs for the whole trip. I was wondering how the 5.7 is with gas milage while towing. Thanks
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  #39  
Old 07-24-2011, 05:52 PM
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Re: Towing and fuel economy 3.6L not acceptable

Averaged 19 litres per 100 klm mate, which if my calculation is correct, is 12.4 mpg (US).

Anf that was not taking it particularly easy, more than keeping up with highway traffic.

Keep in mind my load was a race car on an open dual axle trailer with quite a low profile (no spare tires on racks up in the airstream).
If it were a van with higher wind resistance, it'd be a different story on consumption.
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  #40  
Old 07-25-2011, 10:28 AM
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Re: Towing and fuel economy 3.6L not acceptable

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Originally Posted by Marlin View Post
Averaged 19 litres per 100 klm mate, which if my calculation is correct, is 12.4 mpg (US).

Anf that was not taking it particularly easy, more than keeping up with highway traffic.

Keep in mind my load was a race car on an open dual axle trailer with quite a low profile (no spare tires on racks up in the airstream).
If it were a van with higher wind resistance, it'd be a different story on consumption.
Just to compare the effects of a closed vs. open trailer, I pulled a 5000 lb 16' long x 6' tall enclosed V-Nose cargo trailer (20' overall length ball to tail) 2400 miles this summer from FL to MO then back through NC/TN/GA mountains and averaged ~11 mpg.

According to the EVIC the best steady state MPG @ 70 mph was 13 mpg. Surprisingly, unloaded @ 2500 lbs the EVIC displayed 70 mpg best MPG is only a touch better @ 13.5 mpg. So as you can see, the drag of the tall box contributes more to MPG than weight which might explain the OP's lower than expected MPG hauling a camper vs. some hauling cars or boats.
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  #41  
Old 07-25-2011, 06:37 PM
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Re: Towing and fuel economy 3.6L not acceptable

^^^^ True.

Once rolling, the weight isn't the issue, wind resistance by far.

I can actually measure the difference in economy with my front spoiler off...... and I didn't expect that to be honest.
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  #42  
Old 07-25-2011, 07:13 PM
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Re: Towing and fuel economy 3.6L not acceptable

Something is seam off on your ride... I'm getting 20+ mpg with my 3.6 towing 1,400 pounds of jet ski, 3 people and 200 pounds of cargo ...

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  #43  
Old 07-25-2011, 07:16 PM
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Re: Towing and fuel economy 3.6L not acceptable

A ski shouldn't even be noticable behind a Jeep. They don't weigh much, and they don't have any wind resistance.
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  #44  
Old 07-27-2011, 03:24 PM
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Re: Towing and fuel economy 3.6L not acceptable

Absolutely love the power of the V-6! Other day a co-worker left his extended cab Chevy Silverado 4x4 in the way and had to be moved with no keys available. Attached a tow strap to mine and the Chevy and presto just pulled it out of the way on asphalt without even breaking my tires!
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  #45  
Old 07-27-2011, 04:31 PM
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Re: Towing and fuel economy 3.6L not acceptable

Think wind resistance and the speed of towing are the issue here, more than weight.
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  #46  
Old 07-28-2011, 02:14 PM
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Re: Towing and fuel economy 3.6L not acceptable

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Originally Posted by JoeSchmoe007 View Post
I see your point but OP towed the same snowmobile and got much better mileage with his previous WK
His previous rig was a diesel WK. My F-350 crew cab long bed 4x4 diesel with a 35 ft gooseneck horse trailer and 3-4 horses and lots of gear (nearly 20,000 lbs total for the truck, trailer, gear, etc and we get 11-12 MPG at 60-70 MPH. 11 MPG towing 1,200 lbs or so is just terrible. That is like having 5 260 lb passengers in your car and getting 11 MPG.
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  #47  
Old 09-09-2011, 10:48 PM
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Re: Towing and fuel economy 3.6L not acceptable

I have a 10' long 6' wide enclosed trailer with a v-nose. Weight is under 3000 lbs.
I just did a trip and got around 13.5 mpg US with a hemi.
The hemi sure pulls nicely.
I don't bother with the tow/haul mode as it works just fine without it.
I have always towed these loads in overdrive without any problem.
Now if I was towing 7000 lbs I might change my tune.
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  #48  
Old 09-11-2011, 06:45 AM
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Re: Towing and fuel economy 3.6L not acceptable

I dont know what your break in is like, but if youre not driving it like a pissed off high schooler, youre not doing it right.

Dont tow in OD...I wonder if the throttle was opening so much in 5th that it may have been killing your gas mileage. Sometimes there are voids in the shifting algorithms that lead you being in a high load situation but no downshift to a lower gear.

Regardless, this is a characteristic of a vehicle that depends on rpms to make decent power.
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