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Discussion Starter #1 (Edited)
Need some help! Up to now my JGC ED has been a great car! Now bad mpg has happened after FCA dealer performed recalls to include R-69 emissions recall.

About 40k miles with no problems other than delivered with faulty fan clutch when new. Trip mileage 27-31 mpg highway for long multi-state trips. City was about 23-25. Now getting 17-18 city and 24-25 highway for flat Florida interstate highways. Tires 37psi. No load except me and DW.

Reduced mpg noticed after recalls completed. The two subsequent dealer trips with parts replacements did not result in any improvement. DEF has been in tank for unrecalled time. No regen light.
 

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I wonder if this could be the sudden colds we are getting nationwide. Cold weather will drop the mileage drastically.
 

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Discussion Starter #3 (Edited)
I wonder if this could be the sudden colds we are getting nationwide. Cold weather will drop the mileage drastically.
Update. Am in Florida. Temps were 70s and lo 80s when this issue started. Latest trip 230 miles achieved exactly 26.0 mpg. Not too bad. Plan to check air filter tomorrow. It's not due, but is getting mature.
 

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Discussion Starter #4 (Edited)
Good news. Fixed! Dealer diesel mech reviewed recent recalls, checked case with STAR group, replaced air filter, drained and renewed DEF, etc. Took car on test drive for about 40 miles on Interstate. Highway mileage back to normal. JGC ED great again!
 

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Need some help! Up to now my JGC ED has been a great car! Now bad mpg has happened after FCA dealer performed recalls to include R-69 emissions recall.

About 40k miles with no problems other than delivered with faulty fan clutch when new. Trip mileage 27-31 mpg highway for long multi-state trips. City was about 23-25. Now getting 17-18 city and 24-25 highway for flat Florida interstate highways. Tires 37psi. No load except me and DW.

Reduced mpg noticed after recalls completed. The two subsequent dealer trips with parts replacements did not result in any improvement. DEF has been in tank for unrecalled time. No regen light.


Me too. Same time frame in Michigan since late summer 2017.
 

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My mpgs have dropped significantly, too. Mine is a 2015 Overland diesel w/ Off-Road Adventure II (w/ 3 sets of different Chief Products bash plates and Mopar Rock Sliders ever since 2016). I had originally been getting consistent 23 mpg city and 28 mpg highway, and as high as 31 mpgs on several trips to/from Michigan's Upper Peninsula (around 800 to 1,100 mile round trips) up until the summer of 2017. However, ever since then, after the Jeep dealer "upgraded" the emissions programming, my mpg city has fallen to 18 and went down to only 23-24 mpg highway (at 80 mph, with Yakima round bar roof racks). I changed out the old Michelin A/Ts I'd been running since 500 miles about 2 months ago for a set of Goodyear Wrangler Duratracs (which I have run on my old Chevy Tahoe 4x4 for the past 6 years). I have noticed no change in mpgs between the old Michelins and the new Goodyear Duratracs. And I love those Duratracs on the Jeep! They performed fantastic off-road in northern Michigan this past hunting season! Currently I have about 36.5K miles on odo. Other than the reduced mpgs and needing brake job on rears next week, it's been trouble free (except for 3 body damage events off-road (by me) and 2 others, one by a hit-and-run idiot in a parking lot and another on the expressway when an ice chunk flew off a truck and put dents in the hood of my Jeep).
 
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