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  #49  
Old 04-18-2011, 11:23 PM
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Re: Question about Sport mode

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Originally Posted by AAAA View Post
Hey Parks 311, you might reconsider your observation on the ECO light indicating that you are driving above your average MPG. Mine will come on if you are driving "light footed" at less than current average MPG. I believe that the calculations for the ECO light are independent of average MPG.
You're right. I noticed that today while driving home. I wonder what the threshold truely is for the V6? We know it's all about the MDS on the V8. Maybe we will never know....LOL
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  #50  
Old 04-19-2011, 07:30 AM
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Re: Question about Sport mode

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Originally Posted by Parks311 View Post
You're right. I noticed that today while driving home. I wonder what the threshold truely is for the V6? We know it's all about the MDS on the V8. Maybe we will never know....LOL
Mine will come on starting at about 10mph. I know the mds is not active at that speed. The eco light seems like it is for looks and really has no function. Or maybe Jeep put it in there to make you think about driving with a light foot to conserve gas. Or maybe they just needed to fill a spot on the dash with something and figured an eco light would be good.
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  #51  
Old 04-19-2011, 12:34 PM
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Re: Question about Sport mode

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Originally Posted by 77rednecktruck View Post
Mine will come on starting at about 10mph. I know the mds is not active at that speed. The eco light seems like it is for looks and really has no function. Or maybe Jeep put it in there to make you think about driving with a light foot to conserve gas. Or maybe they just needed to fill a spot on the dash with something and figured an eco light would be good.
I looked in the owner's manual and couldn't find any reference to ECO mode in the Index. Has anyone found anything?
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  #52  
Old 04-19-2011, 01:40 PM
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Re: Question about Sport mode

I don't know what the threshold is for ECO light, but it certainly is there more for entertainment purposes. I mean, I know that when going up hill or accelerating I am not being "ECO" and when on cruise on level or going downhill I am being "ECO".
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  #53  
Old 04-19-2011, 07:02 PM
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Re: Question about Sport mode

Seems to me the ECO light works about as well as the old 1970s fuel economy lights - and they basically just worked off engine vacuum at the intake manifold. If the throttle is more closed than open the vacuum is high and the old Economy gauges would indicate fuel saving.
No doubt with all of today's computer control and various sensors, the ECO light may be more complex. But maybe not...

Edit: only applies to the V6
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Old 06-08-2011, 09:44 PM
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Re: Question about Sport mode

+1 Add my 2c on sport mode:

The acceleration tip-in increase is small but meaningful (and avoids a bit of lag w/the V6), the extra hold in gear is useful, and most of the time I find myself thinking this should be the default mode of the car. You really notice the steering lightening up too from the 80/20 rear/front split. When it's dry outside this is the way to go.

I chose the V6 over the V8 b/c 20,000+ driving miles/yr would mean a few grand more a year in gas (and honestly the frequency of fill-ups would be even more annoying). My heart would love the V8 - but I don't need it on the family car. Sport mode basically (IMO) corrects some of the flaws in the weakest part of the WK2 - the transmission.

Besides, if Ford can make a supercharged V8 with 550hp and 510ft-lb (new Mustang), and 15/23 mpg ratings, I might just wait until Chrysler catches up. Surely 510ft-lbs will move our 5000lb truck. Can't wait.
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  #55  
Old 06-09-2011, 02:24 PM
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Re: Question about Sport mode

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Originally Posted by I78Warrior View Post
+1 Add my 2c on sport mode:

The acceleration tip-in increase is small but meaningful (and avoids a bit of lag w/the V6), the extra hold in gear is useful, and most of the time I find myself thinking this should be the default mode of the car. You really notice the steering lightening up too from the 80/20 rear/front split. When it's dry outside this is the way to go.

I chose the V6 over the V8 b/c 20,000+ driving miles/yr would mean a few grand more a year in gas (and honestly the frequency of fill-ups would be even more annoying). My heart would love the V8 - but I don't need it on the family car. Sport mode basically (IMO) corrects some of the flaws in the weakest part of the WK2 - the transmission.

Besides, if Ford can make a supercharged V8 with 550hp and 510ft-lb (new Mustang), and 15/23 mpg ratings, I might just wait until Chrysler catches up. Surely 510ft-lbs will move our 5000lb truck. Can't wait.
Even at 20,000 miles per year your talking about maybe a $900 difference in annual gas expenses between the V6 and V8 with gas at $4/gallon. Something is wrong with your math. I routinely get 21+ Highway with my Hemi, and the V6 wont do much better.

Using the actual EPA combined numbers:

Hemi: 20,000/15MPG (Combined city/highway) * $4/gallon = $5,333 per year on gas
V6: 20,000/18MPG (Combined city/highway) * $4/gallon = $4,444 per year on gas

It's an $899 difference per year, but if your doing mostly highway driving at high speed that's where the difference goes down to maybe 2MPG at the most.

Anyway, I'm not saying the V6 wasn't the best choice for you, but it's hard to tweak the math to show that it saves you $2,000/Year.

I have never gotten under 20MPG Highway in my 4x4 Hemi cruising at around 82MPH.
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  #56  
Old 06-09-2011, 02:40 PM
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Re: Question about Sport mode

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Originally Posted by vikingdave View Post
I routinely get 21+ Highway with my Hemi
Are you running slicks, on perfect graded roads, no hills, a wind tunnel test fan behind you, oh and....magic??????

I'm struggling around 13-14.5 with 50% highway at 70mph. And no, I'm not going uphill every second of the day too.

My old WK Hemi, in my best trip, highway miles got 19mpg. No way is my heavier WK2, that sometimes can't get out of its own way, is ever gonna do 19 for me....

...and this message DOES include my surgery for the removal of lead from my right foot too.
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  #57  
Old 06-09-2011, 02:44 PM
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Re: Question about Sport mode

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Are you running slicks, on perfect graded roads, no hills, a wind tunnel test fan behind you, oh and....magic??????

I'm struggling around 13-14.5 with 50% highway at 70mph. And no, I'm not going uphill every second of the day too.

My old WK Hemi, in my best trip, highway miles got 19mpg. No way is my heavier WK2, that sometimes can't get out of its own way, is ever gonna do 19 for me....

...and this message DOES include my surgery for the removal of lead from my right foot too.
Michelin LTX M/S2, more aggressive than the Latitudes

That's with the cruise set, and very little traffic for very smooth driving.

I even got 20 this winter from Fort Collins (5,000 FT above sea level) all the way up to Loveland Pass(12,000) and back for my round trip mileage.

Are you running the recommended 89 Octane gas ? I actually run 87 just because you can drop about 2 octane at 5,000 above sea level on any normally aspirated engine. At the lower altitudes you will suffer some mileage decrease with 87.

Many other members on this board also see 20+ routinely on long highway trips with their Hemi's.
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Old 06-09-2011, 03:10 PM
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Re: Question about Sport mode

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Originally Posted by vikingdave View Post
Michelin LTX M/S2, more aggressive than the Latitudes....

Many other members on this board also see 20+ routinely on long highway trips with their Hemi's.
I have the 20's, but still the variance in highway mileage mpg is too great. As for other members, lets define what a "long highway trip" is. In NY/NJ, long highway trips are 30 minutes or so. That's just about how long you can go without then hitting traffic. Of'course, if I'm traveling a death valley highway to nowhere, I'm sure I can get back into the mid-high teens, yet still would be amazed at 20+

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Originally Posted by vikingdave View Post
Are you running the recommended 89 Octane gas ? I actually run 87 just because you can drop about 2 octane at 5,000 above sea level on any normally aspirated engine. At the lower altitudes you will suffer some mileage decrease with 87.
I'm running 89, but even if I did drop to 87, I 'might' lose 1 mpg. Alternatively, I think if I ran 93 I could see a gain of 2mpg based on previous V8's I drove (X5 and a WK.)
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  #59  
Old 06-09-2011, 09:21 PM
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Re: Question about Sport mode

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Originally Posted by vikingdave View Post
Even at 20,000 miles per year your talking about maybe a $900 difference in annual gas expenses between the V6 and V8 with gas at $4/gallon. Something is wrong with your math. I routinely get 21+ Highway with my Hemi, and the V6 wont do much better.

Using the actual EPA combined numbers:

Hemi: 20,000/15MPG (Combined city/highway) * $4/gallon = $5,333 per year on gas
V6: 20,000/18MPG (Combined city/highway) * $4/gallon = $4,444 per year on gas

It's an $899 difference per year, but if your doing mostly highway driving at high speed that's where the difference goes down to maybe 2MPG at the most.

Anyway, I'm not saying the V6 wasn't the best choice for you, but it's hard to tweak the math to show that it saves you $2,000/Year.

I have never gotten under 20MPG Highway in my 4x4 Hemi cruising at around 82MPH.

Forgot that the whole V8 mileage discussion could be a point of contention - I don't dispute your mileage, or the others on the forum who report a lot less or more. Lots of factors come into play. If I had the V8, no doubt I would use it too (how could you not? :-). Guy I know with the V8 gets 15-16 combined - I get about 21-22. ~300 gallons/year diff. That was my back-of-the-napkin calc (plus the $ of the engine). No doubt he grins more too, however. Nothing wrong with getting what you paid for.

I did try and do a 65-mph-only tank of gas last week - man, it's hard! - and ended with 516 miles on a tank when almost down to fumes. My regular driving style gets about 450-480 per tank. I do still need to deal with NYC-area traffic.

But I concede your point anyway - this isn't the Prius forum, none of us bought the JGC for mileage. My point was just that Sport Mode is a better mate between the V6 motor (which actually likes to rev) and the wheels. With the V8, I'm sure it's much less important with all that power down low.
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Old 06-09-2011, 10:33 PM
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Re: Question about Sport mode

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Originally Posted by I78Warrior View Post
Forgot that the whole V8 mileage discussion could be a point of contention - I don't dispute your mileage, or the others on the forum who report a lot less or more. Lots of factors come into play. If I had the V8, no doubt I would use it too (how could you not? :-). Guy I know with the V8 gets 15-16 combined - I get about 21-22. ~300 gallons/year diff. That was my back-of-the-napkin calc (plus the $ of the engine). No doubt he grins more too, however. Nothing wrong with getting what you paid for.

I did try and do a 65-mph-only tank of gas last week - man, it's hard! - and ended with 516 miles on a tank when almost down to fumes. My regular driving style gets about 450-480 per tank. I do still need to deal with NYC-area traffic.

But I concede your point anyway - this isn't the Prius forum, none of us bought the JGC for mileage. My point was just that Sport Mode is a better mate between the V6 motor (which actually likes to rev) and the wheels. With the V8, I'm sure it's much less important with all that power down low.
It's not really a point of contention too me, different strokes for different folks. It's nice to have engine choices on all models. I do think that the V8 tends to like high speeds better than the V6 though. My highway mileage really doesn't do any better at 65 or 70 than it does in the low 80's, and either way it pretty much stays in ECO mode as long as it's flat or downhill. My gut is that the V6 really does have a noticeable difference around town versus the Hemi, but up above 75MPH the engines become very similar in terms of economy because the V6 has to work pretty had while the Hemi just happily lugs along. My roads here are very open, if I did a lot of heavy stop and go I might prefer the V6.

I actually prefer and always use Sport mode even with the V8, the shift points are just much better, and it's drives better overall. I wish they had a mode with sensible shift points and torque distribution similar to the auto mode. For me, auto mode is next to worthless once you get a feel for sport mode.
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