post #16 of Old 03-19-2008, 02:22 PM
insmanblue
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Forget Hybrid, I think not. Diesel futures are rising faster than reg. unleaded futures. In my area, the price differential between reg unleaded and diesel is now .50 and rising.


2008 Grand Cherokee Limited | Light Greystone Pearl | 4.7 | MyGig | HID | Silverstar | Tow Package | Body Color Grill | LED Tail Lights | 1.25" Wheel Spacers | Goodyear Fortura Triple Tread |
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post #17 of Old 03-19-2008, 03:46 PM
sabre364
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Quote:
Originally Posted by insmanblue View Post
Forget Hybrid, I think not. Diesel futures are rising faster than reg. unleaded futures. In my area, the price differential between reg unleaded and diesel is now .50 and rising.
Its about $.90 more for diesel here.
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post #18 of Old 03-19-2008, 08:18 PM
HurriJeff
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I have never really checked my economy manually. We could possibly be reading bad data <shrug>! We just take for granted that that computer is telling the truth LOL. Arthur C Clarke would have had a thing or two to say about that!

05 Grand Cherokee Limited 5.7 Hemi 265/65/17 Revos, K&N
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post #19 of Old 03-19-2008, 10:21 PM
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Had a similar problem with mpg's in a chevy 1500 I had at one time. I had the V6 and my dad had one with a small V8. We got similar mpg's.

I was convinced at the time that the V6 had to work harder and so had to put more fuel to it. Whereas the V8 had plenty of power without having to put your foot in it. Since then, I am convinced that an intermediate V8 (like the 4.7 in the GC) would be a better choice than the V6. Jeep SUV's, by design, are heavy vehicles anyway in their class compared to other SUV's. If I were to get a new GC, I would probably opt for the 4.7 flexfuel (especially with an overabundance of E85 where I live) or the CRD. Not convinced I need a Hemi.

Either way, won't happen for a while. I like my CRD Liberty too much. Still having fun with it and getting ready to lift it.

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post #20 of Old 03-20-2008, 06:43 AM
garsarno
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That's what I thought when we bought our '07 Hemi. Just a liitle less mpg than a V6 but a lot more fun...
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post #21 of Old 03-22-2008, 07:38 AM
scottydog
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My 4.7 gets 20-21mpg at 70mph. Something seems to be amiss with your v6.
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post #22 of Old 03-22-2008, 10:13 PM Thread Starter
Cashburn
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Just an update. I've been playing with the cruise control and speed variations and now starting to realize about 19 mpg on the highway. I believe that once we get off the winter gas here and I put some more miles on the car I can probably get back into the expected numbers.

Still watching it.
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post #23 of Old 03-27-2008, 07:50 AM
Passatglx
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05 4.7 I get 18.5- 20.5 mpg highway at 70 mph. The trick is to reset the computer MPG when on the highway. If you don't your taking an average of city plus highway mileage. The V6 should get 20 - 22 on the highway.
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post #24 of Old 03-27-2008, 08:20 AM
07gc
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So far driving around town I have gotten 11 mpg on E85 and almost 14 on 87 I am not really sure which is better yet on the highway
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post #25 of Old 03-27-2008, 06:24 PM
KarlG
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Had a 2008 WK Larado with the 3.7 as a rental for a week and was getting 19 MPG Combined with about 80% Highway at 65-70 MPH. I can't remember the milage that was on it. I think it was in the 15,000 range though.

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post #26 of Old 03-27-2008, 07:07 PM
07 WK CRD
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3.0 Crd

I've been consistently getting 22MPG average with the diesel. The mileage plummets if I drive it hard.

I love the torque above 2,000RPM. Jeep needs to add 1 or 2 ratios to the transmission. The Mercedes GL gets up to ~27mpg with the same engine.
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post #27 of Old 03-28-2008, 04:52 PM
bravo616
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I have about 4000 miles on a 08 JGC with the 3.7. I get between 17-19 city and about 22-24 hwy. This has been consistant from day 1. I take it easy and accelerate very easy. Recommend using Mobile 1 sync oil for both engine and transfer case for best MPG
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post #28 of Old 03-29-2008, 06:56 PM
07gc
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Just got back from driving my 4.7 to Chicago I averaged 19 on gas and 17.1 on E85 this was the first highway trip for the GC.
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post #29 of Old 03-29-2008, 07:32 PM
jeepgaffer
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Yeah...I don't think that's right for the 3.7L. I get around 12-14 MPG in 'real' city driving (Chicago traffic) and about 16 around town in the 'burbs. On a highway trip, I get 20-22 depending on wind and topography (I have 33K miles on my WK). Either your computer is off, or something else is wrong on your WK.

Hope this helps...

2006 Bright Silver Grand Cherokee Laredo
3.7L 4WD ("mostly" stock)
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post #30 of Old 03-30-2008, 11:51 AM
grogie
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Quote:
Originally Posted by Cashburn View Post
Just an update. I've been playing with the cruise control and speed variations and now starting to realize about 19 mpg on the highway. I believe that once we get off the winter gas here and I put some more miles on the car I can probably get back into the expected numbers.

Still watching it.
My wife's KJ has the same V6, and it does get worse millage in the winter (winter: 16 to 17 on the highway, summer: 18-19 at 75 mph, 20-21 at 65 mph).


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