Bad gas mileage

[jman]

I traded my 2018 JL Rubicon for a 2024 JL Willys. My Rubicon that had a 3 inch lift and 35s averaged 19 MPG. My stock Willys is only getting 14 MPG. Driving pattern is the exact same. Has anyone else noticed this?

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[dchemphill1]

The MPG should improve some with engine break in and computer learning your driving habits.

 

[Ratbert]

Same engine?

 

[dstevens]

2024 Willys does not have the front axle disconnect, which could be 1-2 mpg. My 2024 has averaged 14.x MPG over 3000 miles, so you're not alone.

 

[SBLACK502]

Your rubicon had different gears. You probably had 4.10 gears and the Willy’s without recon package is 3.45.. however I do have a 2021 Willy’s with 2in lift and 35’s and get between 18-20 with my stock gears 3.45.. I also have the 2.0T

 

[jman]

The MPG should improve some with engine break in and computer learning your driving habits.

That's what I am hoping but my last Jeep was never that bad.

Same engine?

Yeah 3.6 in both

Your rubicon had different gears. You probably had 4.10 gears and the Willy’s without recon package is 3.45.. however I do have a 2021 Willy’s with 2in lift and 35’s and get between 18-20 with my stock gears 3.45.. I also have the 2.0T

Both have the same gears (4.10) and same rear axles.

 

[SBLACK502]

Interesting..

That's what I am hoping but my last Jeep was never that bad.



Yeah 3.6 in both




Both have the same gears (4.10) and same rear axles.

 

[jeepoch]

@jman,

Jason, what power-plant, transmission and gearing do you have? Since you mentioned your Willy's is stock, I'm suspecting the standard non-Rubicon 3.45 gears. Yet, I'm pretty sure that package my have other axle options.

Where in the USA do you hang out? What type of dinosaur goo do you prefer? Do you have a heavy or light foot? Did your Ruby have the same engine/tranny combo?

If you have the 2.0L Turbo, do you enjoy the boost during accelerations?

Is it a 4-Door? How much gear or cargo do you typically haul around?

Do you live anywhere that someone may be nefarious at siphoning your tank?

Is it by chance a 4xe variant. I don't know what packages they are now electrifying. Basted on all the EV htpe, I'd suspect Jeep is putting the big heavy batteries now in everything.

Without more info it's hard to help.

For reference and not to make you even more frustrated, my 2019 JL 2-Door 3.6L non-eTorque, Auto Sport with the 3.45 gears, lifted on 35's, I can typically goose 25 mpg on the highway and average around 23 around town along the Colorado Front Range.

My current average measured over the last 1512 non-offroad miles is currently at 22.4. I typical reset my lie-o-meter before and after each off-road excursion.

I'm sure there's some answers in here somewhere.

Regards,
Jay

 

[Dowayno]

I was a little surprised as well with all the green tech and govt micro management.

My 2dr 2012 Rubicon v6 was set up with 35s and was getting about 10mpg and with the bullydog gt it went to mid 20s mpg at 75 mph. Props to bullydog.

When I bought my 2dr 2022 willys v6 on 37s I'm getting 17.5 with a k&n cai. Still not bad for a freeway brick on wheels at 70 mph. Went to to bullydog website and they don't make the gt. Huge bummer imo and don't even try to email that company. They suck at reading english. Still debating on pulling the trigger for 4.88s and out of ideas on a programmer piggy backing the tazer. But this plastic bumper needs to go and a wench is needed. Bye bye 17.5 mpg, lol

 

[bthomp]

Given you went from one Jeep to the other, time of year wouldn't be a factor here, but this is the time of year (winter / ethanol) where my mileage goes down 2-3mpg.

 

[Bill_BCNtoNY]

Given you went from one Jeep to the other, time of year wouldn't be a factor here, but this is the time of year (winter / ethanol) where my mileage goes down 2-3mpg.

same here, maybe even a bit more of an MPG loss. my Sahara on Rubi-sized wheels and a ~2.5” lift went from ~18mpg to ~13MPG in my same usual and unfortunate suburban driving pattern.

 

[LC80]

With a 2024 2-door Rubicon X, 4.10 gears, 3.6AT, Mopar 2” springs and 37 KO2 load-range C tires, computer tells me 14.5 mpg. Elevation is 300’ with a mix of highway and surface streets. It’s an improvement for me from what I was driving!

 

[Heimkehr]

my Sahara on Rubi-sized wheels and a ~2.5” lift went from ~18mpg to ~13MPG in my same usual and unfortunate suburban driving pattern.

I've recurringly calculated the effect of winter-blend gasoline on my average fuel efficiency, and have landed at a reasonably fixed -2.5 MPG. This is with no other changes on the vehicle or with my driving habits.

I do sometimes wonder if the denser winter air has any effect on the aforementioned calculation, but that's not a rabbit hole I'm interested in descending at this time.

If the winter tires/wheels are installed, which is a 20 lb. increase in unsprung weight at each corner, that -2.5 increases to -4.x MPG.

As a reasonably conservative driver who enjoys genuinely good fuel mileage during the Warm Times™, the MPG hit is one of the few things about Winter that I don't look forward to.

 

[Deleted User 38384]

I traded my 2018 JL Rubicon for a 2024 JL Willys. My Rubicon that had a 3 inch lift and 35s averaged 19 MPG. My stock Willys is only getting 14 MPG. Driving pattern is the exact same. Has anyone else noticed this?

SHOULDA BOUGHT AN ECODIESEL

 

[Ratbert]

I do sometimes wonder if the denser winter air has any effect on the aforementioned calculation, but that's not a rabbit hole I'm interested in descending at this time.

Denser air negatively impacts aerodynamics, but don't forget that it also contains more oxygen so it burns more efficiently.

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