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Unread 03-31-2013, 02:38 PM   #31
jesse12801
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If you never hit the highway the mpg's keep going down,down,down..hit the highway once in a while to raise it.Keep it around 65 when you do.07 GRAND CHEROKEE 3.7.

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Unread 03-31-2013, 08:50 PM   #32
jaje
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Quote:
Originally Posted by trax95008 View Post
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.
This was the reason why the 90's and early 00's Ford Explorers were extremely dangerous on the highway. Ford had issued instructions to dealers to inflate tires to only 26 psi in order to make them more stable at highway speeds (they were very tippy from internal testing especially the 2 door sport version with very narrow length and width wheelbase). The owners almost never routinely checked their tire pressures leading to < 26 psi tires (and premature tire wear on the sidewalls) and when going 45+ mph they would blow out and flip over with amateur drivers killing most inside the vehicle. Often the only survivor in these single car rollovers was an infant in a childseat as they were short enough that the roof collapse did not endanger them as much. Sad stories about all this happening and reason why low pressure warnings or TPMS systems are standard on almost all SUVs sold today.
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Unread 04-02-2013, 09:29 AM   #33
ChanWK
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Quote:
Originally Posted by jesse12801 View Post
If you never hit the highway the mpg's keep going down,down,down..hit the highway once in a while to raise it.Keep it around 65 when you do.07 GRAND CHEROKEE 3.7.
Might give that shot. I got nothing to loose.
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Unread 04-03-2013, 01:28 PM   #34
grandcher0kee06
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Reset the MPG's on the dash, if you havent done that since the previous owner had it that could help you get a more accurate calculation. It could say 9mpg but that might be with 50,000 miles worth of recorded driving that its getting 9mpg from. So when your just driving around town it wont change immediately or you wont see any differences. Hope this helped
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Unread 04-03-2013, 01:37 PM   #35
texan2
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Originally Posted by BillyZim View Post
I could be wrong but I do remember reading that you should not use any spray throttle body cleaner on your wk. I do remember reading that it will cause damage.

My Hypertech programmer (part# 52501) gave me a gain of almost 2 mpg. It also improved acceleration. I readjusted my tire size with it too.
Is that programmer the type that you plug in, re-program and unplug? or do you leave it hooked up all the time?
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Unread 04-04-2013, 11:01 AM   #36
Piepenbrok420
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Quote:
Originally Posted by texan2 View Post
Is that programmer the type that you plug in, re-program and unplug? or do you leave it hooked up all the time?
You unplug it
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Unread 04-04-2013, 04:37 PM   #37
ChanWK
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Quote:
Originally Posted by grandcher0kee06 View Post
Reset the MPG's on the dash, if you havent done that since the previous owner had it that could help you get a more accurate calculation. It could say 9mpg but that might be with 50,000 miles worth of recorded driving that its getting 9mpg from. So when your just driving around town it wont change immediately or you wont see any differences. Hope this helped
How would I reset it?
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Unread 04-04-2013, 07:33 PM   #38
Jeepforthewin
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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.
Hahaha well said! Same here for me glad I'm not the only one!
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Unread 04-04-2013, 07:37 PM   #39
Jeepforthewin
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Quote:
Originally Posted by ChanWK

How would I reset it?
When you have your MPG's showing in the evic screen just hit reset on the information center buttons.
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Unread 04-06-2013, 08:59 AM   #40
ChanWK
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Originally Posted by Jeepforthewin View Post

When you have your MPG's showing in the evic screen just hit reset on the information center buttons.
Sounds good thanks
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Unread 04-12-2013, 09:24 PM   #41
dsjr2006
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10 in town, 14-16 hwy seems to be about average. Also makes me wish I had the CRD!
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Unread 04-13-2013, 12:01 PM   #42
leftoverture
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I've been getting around 15-16mpg combined highway/city in my 4.7 Laredo. Only had it a week, though, so only about 770 miles to calculate it from. Temps have been in the 30's and low 40's during that time and I've used the cruise only sparingly on longer freeway runs. I did not buy this thing for the gas mileage though. I have my Corvette for that.
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