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Discussion Starter #1 (Edited)
Hello everyone!

I need of your help to know what is happening whit my New Jeep Compass 2018, Trailhawk version, engine: "2.4L 4 CIL 16V MultiAir2 - Start/Stop" because it not giving me a good fuel efficiency and is not even close to what What the manufacturer promises with respect to the performance (MPG: 22 City / 30 Hwy) so as complementary information I share the state of the engine during its city operation to contemplate as many variables as possible to help me with the answer:

Fuel Economy: 12.44 MPG (22.7 L/100km)
AVG: 11.7 MPG (24 L/100km)
Transmission Temp: 159.8°F (71°C)
Coolant Temp: 228.2°F (109°C)
Tire Pressure (PSI):37, 34,34,34
Oil temp: Middle of the Dial (See pic)
Battery Voltage: 14.2v

My dealer tells me that all the system is normal and does not show faults in the scanner and he asks me to wait until the engine has more mileage to see if with this improves the performance
 

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yeah, wow, that's bad fuel economy! Hard to imagine a MultiAir actually burning that much fuel - I wonder if the numbers are wrong for some reason.
I suggest that you should manually track your fuel usage, ie, note how much fuel you put in at each fill up and compare that to distance driven. I also would (carefully) feel the wheels immediately after a highway drive - if a wheel is unusually hot it could indicate some binding or brake dragging.
 

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I have close to 15,000 miles now on my Trailhawk. I drive 95% state highways. 55 to 65mph. I keep a log of my mileage and as of today I have a average of 28.8. mpg.
It has gone down a couple MPG since I installed my snow tires and the winter gas formula. My worst was 22.75 MPG my Best was 32.5 MPG.
 

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I’ve been searching for the latest “TSBs” (technical service bulletins) since my 18 TrailHawk has the dash non-dimming problem. Nothing yet for a software update but on the NSTSA site I did come across 4 manufacturers comms that might effect my compass (built in Aug 17) and yours.
There is (not a recall) a bulletin for the dealers to update the “PCM” (power control module) which might effect the powertrain and fuel milage?
Mopar has a fancy owner’s website (which lists recalls) but it fails to list or inform you of “service bulletins”.

NHTSA ID Number: 10121779

Manufacturer Communication Number: 18-082-17

Summary

Flash: Powertrain Diagnostic and System Improvements

This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software.

Vehicle was built with incorrect Powertrain Control Module Calibration.

1 Affected Product
Vehicle

MAKE MODEL YEAR

JEEP COMPASS 2018







Hello everyone!

I need of your help to know what is happening whit my New Jeep Compass 2018, Trailhawk version, engine: "2.4L 4 CIL 16V MultiAir2 - Start/Stop" because it not giving me a good fuel efficiency and is not even close to what What the manufacturer promises with respect to the performance (MPG: 22 City / 30 Hwy) so as complementary information I share the state of the engine during its city operation to contemplate as many variables as possible to help me with the answer:

Fuel Economy: 12.44 MPG (22.7 L/100km)
AVG: 11.7 MPG (24 L/100km)
Transmission Temp: 159.8°F (71°C)
Coolant Temp: 228.2°F (109°C)
Tire Pressure (PSI):37, 34,34,34
Oil temp: Middle of the Dial (See pic)
Battery Voltage: 14.2v

My dealer tells me that all the system is normal and does not show faults in the scanner and he asks me to wait until the engine has more mileage to see if with this improves the performance
 

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Discussion Starter #5
Hi Reagan39

This information is very helpful to me and matches the symptoms that my compass presents now and it also have problems with dimming of the interior lights sometimes works and sometimes not, could you share to me the link of the bulletin that you mention of NHTSA ID Number: 10121779 please? to review
 

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Hi Reagan39

This information is very helpful to me and matches the symptoms that my compass presents now and it also have problems with dimming of the interior lights sometimes works and sometimes not, could you share to me the link of the bulletin that you mention of NHTSA ID Number: 10121779 please? to review
Sorry, I tried 3 times. The forum will not give me permission to add links yet.
Search for NHTSA.GOV/vehicle
If you have the dash non-dimming problem, you can also file a complaint about that on NHTSA.GOV...THE NUMBER OF COMPLAINTS have doubled in the last few weeks....the more, the greater urgency for Jeep to address the problem.
 

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Discussion Starter #7
Sorry, I tried 3 times. The forum will not give me permission to add links yet.
Search for NHTSA.GOV/vehicle
If you have the dash non-dimming problem, you can also file a complaint about that on NHTSA.GOV...THE NUMBER OF COMPLAINTS have doubled in the last few weeks....the more, the greater urgency for Jeep to address the problem.
Thank you very much for the help, tomorrow I will go with my dealer and show this bulletin and with the other issue, I will send my complaint of interior dimming light control to have solution ASAP from the manufacturer

regards,
 

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Discussion Starter #8
1Recalls
Associated with this VIN
Nov 21,2017
Manufacturer Recall NumberT70
NHTSA Recall Number17V-740
Recall StatusRecall Incomplete

Summary
The IPC photo sensor calibration may prevent detection of day-to-night lighting transitions. The condition above fails to conform to FMVSS No. 571.101, Controls and displays.

Safety Risk
The dimmer switch will be unable to provide lower levels of brightness, which may reduce driver visibility at night and lead to a crash without prior warning.

Remedy
The Instrument Panel Cluster (IPC) software must be updated.
 

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I have a 2017.5 Trailhawk compass which was delivered DoA with a bad throttle body (no joke) and I have only been able to get around 21 MPG over the 7,500 miles I've driven it. I suspect it has to do with the bad throttle body and potentially damage that might have been done to the fuel system. I thought mine was bad... yours takes the cake.

I'm taking it in for the first service tomorrow and asked dealer to look at it. Spoke with rep at FCA who took care of initial throttle body problem to reach out to dealer to try to get them to take a closer look, rather than blow me off. Already getting the "MPG estimates aren't 'real world', you need to break it in, it's very cold out and that impacts MPG." I've seen some you tube videos of mileage testing and it seems to confirm lower than estimated MPG in real world applications. I'd be thrilled with mid-20s, given 22-30 estimates. Be interested to see what others are getting in terms of real world MPG.
 

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I have a 2017.5 Trailhawk compass which was delivered DoA with a bad throttle body (no joke) and I have only been able to get around 21 MPG over the 7,500 miles I've driven it. I suspect it has to do with the bad throttle body and potentially damage that might have been done to the fuel system. I thought mine was bad... yours takes the cake.

I'm taking it in for the first service tomorrow and asked dealer to look at it. Spoke with rep at FCA who took care of initial throttle body problem to reach out to dealer to try to get them to take a closer look, rather than blow me off. Already getting the "MPG estimates aren't 'real world', you need to break it in, it's very cold out and that impacts MPG." I've seen some you tube videos of mileage testing and it seems to confirm lower than estimated MPG in real world applications. I'd be thrilled with mid-20s, given 22-30 estimates. Be interested to see what others are getting in terms of real world MPG.
My advice:
Actual MPG may vary.
Cold temperatures affect mileage
Stop and go traffic and driving habits greatly affect mileage
Gas blend may affect mileage.


You've never heard that awesome info before, I know. j/k

But it's actually true. Such subtle differences are huge. Phoenix here is about as flat as can be. But I drive across town one way, and I get 28mpg. Coming back, it's 26mpg.
Something is different that I can't even tell is different.
 

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Hello everyone!

I need of your help to know what is happening whit my New Jeep Compass 2018, Trailhawk version, engine: "2.4L 4 CIL 16V MultiAir2 - Start/Stop" because it not giving me a good fuel efficiency and is not even close to what What the manufacturer promises with respect to the performance (MPG: 22 City / 30 Hwy) so as complementary information I share the state of the engine during its city operation to contemplate as many variables as possible to help me with the answer:

Fuel Economy: 12.44 MPG (22.7 L/100km)
AVG: 11.7 MPG (24 L/100km)
Transmission Temp: 159.8°F (71°C)
Coolant Temp: 228.2°F (109°C)
Tire Pressure (PSI):37, 34,34,34
Oil temp: Middle of the Dial (See pic)
Battery Voltage: 14.2v

My dealer tells me that all the system is normal and does not show faults in the scanner and he asks me to wait until the engine has more mileage to see if with this improves the performance


Are you buying your fuel from the same gas station all the time? If so try different gas station. The MPG your posting is what I would expect to see from using E-85 fuel. I think some stations are actually selling fuel that is 15% ethanol but pumps are still marked 10%. There was a bill passed that allowed 15% and the industry was actually pushing for 20%. I fear some might be cutting their fuel with E-85. A big no no if they get caught but the actual fine they pay in the court my mean they still end up profiting. As you most likely know the more ethanol in the fuel the less MPG you will get. *Edit should have said in the US a bill was passed to allow 15% ethanol.
 

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Discussion Starter #14
Are you buying your fuel from the same gas station all the time? If so try different gas station. The MPG your posting is what I would expect to see from using E-85 fuel. I think some stations are actually selling fuel that is 15% ethanol but pumps are still marked 10%. There was a bill passed that allowed 15% and the industry was actually pushing for 20%. I fear some might be cutting their fuel with E-85. A big no if they get caught but the actual fine they pay in the court my mean they still end up profiting. As you most likely know the more ethanol in the fuel the less MPG you will get. *Edit should have said in the US a bill was passed to allow 15% ethanol.
Hi

I already made a consumption test with the distributor, they disconnected my fuel line and installed a test tank with a 1/4 gallon of gasoline of 92 octanes in a combined city/hwy route and we obtained: 18mpg of 25.6 mpg on average, compared with other similar vehicles (2018 Jeep Compass Trailhawk), so it can be concluded that if it is a bad calibration or defect of my vehicle.

my dealer is trying that FCA can give a solution about it but for now nothing

Regards,
 

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Also report bad MPG ...

.... on our 2017 2nd Gen Compass Trailhawk. In our case we were initially receiving 22/28 mpg but after ~3000 miles, our mileage is dismal. We now average 16 in town & maybe 23 on highway. We travel from Orlando, FL to Ellijay, GA (~500 miles) every two months or so and have never done better than 23 mpg. It's all highway & cruise is set @ 72 mph. Finally took in for service & dealership cannot give any reason for this poor mileage except to ask where I buy gas. We ask them to keep it another day & possibly "dig deeper". This mileage is no better than my 2016 Ford Transit van, loaded with paint & supplies. Something is wrong here!
 
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