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post #11 of 35 (permalink) Old 03-10-2017, 10:40 AM
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In the winter, I adjust tire pressure to 35 and when we get a warm spell, the pressure can get over 40 pretty quickly.
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post #12 of 35 (permalink) Old 03-10-2017, 10:55 AM
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Just for clarity, we do not get "winter grade" fuel here in Fort Wayne, so this is not a factor for me. I keep the tires at 36 psi all the time. I read somewhere on the forum that below a certain temperature, the PTO readies itself for instantaneous 4wd if needed. I'm guessing that this may be a factor in lower MPGs in cold weather.
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post #13 of 35 (permalink) Old 03-12-2017, 11:13 AM
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Don't forget guys, below 40the auto setting stays in all wheel drive! This and crappy winter gas can sure make a difference.


I don't like that auto feature, cold and dry no need for all wheel drive and down goes the mpg's! On my 60 mile basically highway commute 20/21 at 70 is very good in this colder NE weather. When warmer and summer gasoline a bit better. Still kinda disappointed in this gas mileage and we have two of these things!


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post #14 of 35 (permalink) Old 03-12-2017, 09:58 PM
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Don't forget guys, below 40the auto setting stays in all wheel drive! This and crappy winter gas can sure make a difference.
Is that why the TH MPG rating is so much lower than the other non TH models?
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post #15 of 35 (permalink) Old 03-13-2017, 06:29 AM
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Is that why the TH MPG rating is so much lower than the other non TH models?
No, it is not TH specific. It is all Cherokees with 4x4.
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post #16 of 35 (permalink) Old 03-13-2017, 07:58 AM
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Agreed! This is a real pain for me living in the Sierra Nevada Mountains where temps get really cold then a trip off the mountain to warmer climate creates a lot of pressure changes. I've had low tire pressure warnings in the mornings and it usually goes off by the time it warms up or I go down the hill. It I top them off cold by the time I'm off the hill they are over inflated at times, so it's a constant juggle. Just try to find the happy medium. Mileage and tire wear come to mind.
I do not have your problem of extreme temperature swings in the middle Midwest, especially in the same day during one drive. I usually run my tires at 35 as a compromise especially in fall as colder weather approaches. Keeps me out of the under-inflated situation which can be dangerous, especially at higher speeds. That alone can be a big issue in shortened tire life, by heating up the tire.
I have to pump up my PSI when I tow even during the summer depending on weight. Its not unusual that I keep my tires at 35-36 all summer.
The other factor is the door PSI is the recommendation as a compromise between ride, mpg, tire wear by the manufacturer. Your actual PSI will be based on conditions, mainly load on the tires. For most the door is best to follow.
In my opinion it is much better running 2-3 lbs over than 2-3 under. Over inflated produce less heat on the tire and longer life. More heat on the tire will actually damage the tire itself as heat is the enemy of a tire. Even running at 40 will not hurt the tire, but will give you a bumpier ride, a traction difference for the tires, and probably some extra wear. That is unless you have a very heavy load on the rear.
In theory you could go to the max psi cold on the sidewall and be OK but would likely make the vehicle unstable, unless loaded.
So you do have some flexibility in your psi settings beyond the door listing.
I hear that the snow will be around till the 4th of July in the Sierra Nevada this year. But still you have a beautiful place to live.
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post #17 of 35 (permalink) Old 03-13-2017, 08:04 AM
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No, it is not TH specific. It is all Cherokees with 4x4.
This has been a common complaint with Trail Hawks.
My Limited V6, AD2, and Tow get 30+ highway.
In my opinion the mpg on the Hawk is a combination of weight of the skid plates, tires and air flow resistance.
4x4 will lower mpg by 2 mpg over a FWD.
But again on the Cherokee the system defaults to FWD as much as possible negating most of that difference.
Its just the nature of the beast, that is the Trail hawk.

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post #18 of 35 (permalink) Old 03-13-2017, 08:24 AM
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Getting 19mpg city, 23 hwy on my V-6 TH. The mileage isn't a big deal, especially with 100% gasoline hovering around $2.20 gallon.

Just wish it had a bigger fuel tank like my Subaru (18.5 gals). I can easily go over 500 miles on a tank of gas in the Subaru.
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post #19 of 35 (permalink) Old 03-13-2017, 12:10 PM
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I am unaware that it automatically goes into 4WD below 40 degrees. I thought that just to PTU engages to be ready for 4WD, if needed.

Is this TH specific?

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post #20 of 35 (permalink) Old 03-13-2017, 12:31 PM
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I am unaware that it automatically goes into 4WD below 40 degrees. I thought that just to PTU engages to be ready for 4WD, if needed.

Is this TH specific?
Not TH specific. TH and AD2 have same drivetrain/suspension but TH's RDM includes a locker. AD1/AD2/ADL (TH) all use the same logic for auto-engaging AWD as far as we know.

You're right that the PTU engages a dog clutch and spins the drive shaft below a certain temp (maybe around 40° F). What we can't tell (yet) is when the wet clutch (Torque Transfer Device) in the RDM closes to connect the drive shaft to the differential and thus the rear wheels.
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