MPG for 3.2 - 2014+ Jeep Cherokee Forums
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post #1 of 50 (permalink) Old 02-16-2017, 10:24 PM Thread Starter
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MPG for 3.2

After nearly 8000 miles I think my Rhino's engine has finally broke it self in. I was getting almost 31 mpg on my way home from work today. Of course it was difficult keeping my foot off the accelerator and under 70 mph. Click image for larger version

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post #2 of 50 (permalink) Old 02-16-2017, 10:57 PM
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Over 8000 and still waiting to better 20-22 overall in mixed driving in my 3.2 awd w/DA II.


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post #3 of 50 (permalink) Old 02-16-2017, 11:13 PM
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My 3.2 TH is my first vehicle to get worse mileage on my interstate leg of my daily commute. I'm seeing 19.2 to 19.8 indicated and when calculated at the pump, it's almost always 0.8 to 0.9 mpg less than the computer indicated. So, I'm barely over 18 mpg with an 18 / 24 rating. I was expecting 20 mpg avg.

I hope I never make a highway trip that is uphill with a headwind. I'm at about 2300 miles.

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'93 Grand Cherokee Laredo 4.0L 2WD
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post #4 of 50 (permalink) Old 02-16-2017, 11:43 PM
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I average 18 to 20 mixed driving. 26 on a recent trip to Texas

2016 Cherokee sport 3.2 tow package
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post #5 of 50 (permalink) Old 02-16-2017, 11:45 PM
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7.5 months just over 4000 miles and averaging 19-20 mpg calculated at the pump. Vehicle always indicates a wee bit higher mileage than actual. My driving is mixed stop and go city and mountain driving. Have not had a chance to get a decent road trip in yet to check hwy mileage yet.

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Retired Fire Captain spending retirement in the Sierra Nevada mountains of Central Calif. Re-energized Jeep fan.

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post #6 of 50 (permalink) Old 02-17-2017, 01:14 AM
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Last trip to camp I got 25. Some interstate and some two lane mountain roads. Not bad but then I'm an old man and drive like one. Back and forth to work I get 13. It's only a short five mile stop and go drive. 2,400 miles on It so far
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post #7 of 50 (permalink) Old 02-17-2017, 06:52 AM
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2017 3.2 limited AD1 HC 19/20 Mixed Hwy/City, 980 miles OD, Same Driving 2015 5.7 R/T 2015 AWD Charger 14/15 HC, 2015 Laramie CC/LB 4x4 Air suspension 1500 3.0 Diesel 20/22 HC ,2001 Dodge Dakota 3.9 RC/SB 2wd 13/14 HC All calculation's Mix's Hwy/City 50/50.


HC Hand Calculated , LOM Lie-O-meter


LOM are much closer today than years pass, but they reset at certain miles. The Ecodiesel if you drive 200+ miles hwy W/O turning the key off at 201 miles the LOM resets and you loose the 1st 200 miles of calculations.


all kinds of out side variables with the LOM , its nice to look to at the dash for MPG, thinking or believing you are getting the MPG needs to be confirmed HC.


Engines do not break in with todays tight tolerances. with factory operations , Gears ,clutches, wears rings, etc do , but if you are breaking things in at 100+ miles on the DL/Powerplant you will be breaking things in the future, Some urban legends never die on the Social Networks .

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Last edited by TCDiesel; 02-17-2017 at 06:55 AM.
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post #8 of 50 (permalink) Old 02-17-2017, 07:40 AM
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The issue with this Cherokee is the ZF 9 speed and the "AL" logarithms it needs to function properly.
Until it functions properly you will not get the proper mpg out of the 3.2.
I agree that the statement "Engines do not break in with todays tight tolerances" to a certain degree.
That makes the initial break-in (60 and 300 miles) that FCA requires extremely important. And do not forget the initial Tow break in of 500 miles of initial towing. Those requirements are there for a reason.

Now back to the initial comment on the ZF 9 speed and the "AL" logarithms it needs to function properly.
* Now I had the older software on my 2014 but it took almost 3,000+ miles to utilize 8th gear. Before that 7th was the highest it would go.
* 18 months later (after purchase) I had my 1st and only TCM/PCM update. An amazing thing happened. I lost 8th on the highway. That is the 32-33 mpg I usually got was now under 29 or less.
It took 800-1,000 miles to get it back and my mileage to return to 32-33 range. It probably took another 1,000 miles to start utilizing 8th as low as 57 mph. That it never did before on the original software.
That increased the mpg a lot for me especially those lower speed 2 lane roads.
So the ZF 9 speed is more of the function of mpg on this Cherokee. The sweet spot on mpg still seems to be 62 mph or so. Anything over that its down hill. Anything around 70 mph+ is big down hill.
Before they jacked the speed limits up to 70 in Illinois and the highways were 55/65 I actually could hit 34 mpg on my normal 300 mile trips using the same route. That was also using the ACC 100% of the time.
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post #9 of 50 (permalink) Old 02-17-2017, 08:08 AM
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Currently, the best mpg I've gotten is around 22.5, and that interestingly enough was on the drive back after I had just purchased the TH almost 3 months ago. I know I could get 25mpg easily if I'm driving it very carefully, but I don't put much emphasis on it. If I can get 20mpg or better, I'm usually pretty ok with it. This past weekend, I drove down to the Chicago Auto Show, and despite all the stopping and going, driving through different parts of downtown Chicago, and the drive back (which at times I was doing a lot faster than the posted speed limit, i.e., going with the flow of traffic), I still managed to get 21.5mpg.

I suppose one thing I've thought about is if I can manage 300-350 miles on a single tank (if I were to run it all the way down), I'm happy with that. 400 would be killer I think, and if it's at all possible, the magical 500 miles on a tank. I always remember in my Mini, with its 13.2 gallon tank, that getting 400 miles on a tank was the holy grail measure of fuel economy in the R53.

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post #10 of 50 (permalink) Old 02-17-2017, 09:00 AM
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when i drive carefully mixed city-highway - 24
careless 18-20
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