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Unread 03-28-2013, 08:17 PM   #16
Megs_Revenge
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My hemi sucks gas as well. But, you don't really buy these Jeeps based on their excellent gas mileage.

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Unread 03-28-2013, 08:26 PM   #17
Atrain1066
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I get 25mpg out of my 5.7L hemi - 12 around town, and 13 on the highway.
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Unread 03-28-2013, 08:54 PM   #18
trax95008
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Quote:
Originally Posted by Atrain1066
I get 25mpg out of my 5.7L hemi - 12 around town, and 13 on the highway.
Is that a joke?
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Unread 03-28-2013, 11:21 PM   #19
ahillstrom
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I'd say so.
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Unread 03-29-2013, 06:30 AM   #20
jaje
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Quote:
Originally Posted by Atrain1066 View Post
I get 25mpg out of my 5.7L hemi - 12 around town, and 13 on the highway.
That is hilarious! Some of the Hemi Guys say they can get low 20's combined and high 20's highway. I think I now know their calculations.
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Unread 03-29-2013, 08:29 AM   #21
IndyBlueWK
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i love to see 16 on the HWY.. hemi on 265's... I am thinking about throwing the stock intake back on to see if it gets better?
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Unread 03-29-2013, 08:50 AM   #22
gtherman
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Quote:
Why are you telling people not to inflate over 32psi??? My door sticker says 35. Are you telling people to ignore their door sticker?
FWIW, ignore the door sticker if you have tires other than what came on the vehicle. The tires will have a range (25-40 PSI for example), and anything in that range is fine. Don't exceed that limit regardless of what the door sticker says. Usually the door sticker rating falls within the range of the tires, however sometimes this is not the case.
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Unread 03-29-2013, 09:04 AM   #23
trax95008
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Quote:
Originally Posted by gtherman

FWIW, ignore the door sticker if you have tires other than what came on the vehicle. The tires will have a range (25-40 PSI for example), and anything in that range is fine. Don't exceed that limit regardless of what the door sticker says. Usually the door sticker rating falls within the range of the tires, however sometimes this is not the case.
Yes I understand this and agree. I was just making a point at the fact that he specified a precise pressure, without any other explanation or advice. Lets say I still have my stock tires on, and he just told me to run them at a different pressure than what the manufacturer says. It's common to find bad advice on forums, and I was just speaking up to clarify what I considered to be bad advice
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Unread 03-29-2013, 07:32 PM   #24
gtherman
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Good. I just wanted to make it clear that the vehicle's specs were for a particular tire, not just any tire that Joe at the tire store sold you, and that you should always follow the tire specs. It seems as if we have an accord.
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Unread 03-30-2013, 10:28 PM   #25
Walt
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Quote:
Originally Posted by ChanWK View Post
Hey,
So I recently just bought my first car and first jeep and for some reason my fuel economy has been awful. I checked my trip computer and I'm getting 9.5 MPG... I have about 83500 miles on it wondering what I could do to fix it. I've been looking around and people are saying things from new spark plugs, O2 sensors, throttle body cleaner, and new spark plug wires. Any help would be great.

Thanks.

Do you know any of the maintenance history? If not, I recommend picking a service interval from the owner's manual and doing everything to get it back to acceptable performance. For instance, use 60K miles to do the following:
- spark plugs
- PCV valve
- xmission fluid & filter(s)
- fluid change in xfer case & both axles
- new serpentine belt
- air intake filter
- EGR valve (optional)
- spark plug wires (optional)
Now you are starting from a position of knowledge.

Additional considerations:
- When performing normal tire rotations, inspect brake shoes and make sure that the brake pads are not dragging.
- Go to Advance Auto (or equiv) and borrow their code reader. See if there are any active or pending DTC's that you need to pay attention to. Hidden O2 sensor DTC's will adversely affect your mpg's.

Do these things after you check your tire pressures. BTW: I run mine at 34.5 psig cold. Door sticker says 33 psig and tire dealer puts them at 37 psig (I have no idea why) and the ride is uncomfortable at that level.

As a point of comparison, I get 14.5 mpg around town and 18.5 mpg in the 5.7L HEMI.

Hope this helps somewhat. CAUTION: This advice may be worth what you paid to get it!
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Unread 03-31-2013, 11:43 AM   #26
hxdrummerxc
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So far, the highest that I have seen was 20.2 mpg hwy.
Stock everything, stock tire size.

That is using cruise control for about 3 hours straight just to get it that high.


Right now, im only averaging 13.4 mpg
Maybe because its winter, but also because Its hard for me to stay light on the throttle. a part of me doesn't care about the bad gas mileage at all...... but the other part..... the money part, hates it.
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Unread 03-31-2013, 12:03 PM   #27
suzieque
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Quote:
Originally Posted by trax95008 View Post
Why are you telling people not to inflate over 32psi??? My door sticker says 35. Are you telling people to ignore their door sticker? And what if I had a heavy load in the back and needed a few more pounds to compensate??? I don't understand why your giving this advice...
there are many threads on the net debating tire inflation.

the best info I read to date suggests the door sticker is guidance for ride comfort. The actual tire optimal inflation is 10% less than the number stamped on the sidewall of the tire itself, inflation is measured when the tire is cold (e.g. parked overnight in the garage out of the sun). In my case, this inflation amount (10% less than the number stamped on the sidewall of the tire itself) was higher than the door sticker.

I've read that inflation advice for about a year now, seems fine and no abnormal tread wear, just a firmer ride in the vehicle.
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Unread 03-31-2013, 12:29 PM   #28
trax95008
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The risk of under inflating isn't tire wear, it's sidewall damage. The lower the pressure, the more the sidewall flexes and heats up and degrades resulting in a blowout.
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Unread 03-31-2013, 01:51 PM   #29
Piepenbrok420
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You people are pretty funny, I work on cars for a living so it's pretty entertaining to see what people think is right for their vehicle. I run 40-50 psi in my Load Range E 33" (285/70r17) mud terrains.
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Unread 03-31-2013, 02:01 PM   #30
suzieque
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Quote:
Originally Posted by Piepenbrok420 View Post
You people are pretty funny, I work on cars for a living so it's pretty entertaining to see what people think is right for their vehicle. I run 40-50 psi in my Load Range E 33" (285/70r17) mud terrains.
I do computer support for a living and I read lots of posts from experts arguing about the correct answer to a computer problem.
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