2021 vs. 2024 MPG

[Skeethree]

So, I had one of the earlier 2021 4xe's. It was a fully optioned Sahara. I traded in for a 2024 High Altitude, which is basically a fully optioned Sahara with all-terrain tires. Both had the same axle ratio with the LSD and the same size wheels and tires ('24 Sahara's have more narrow tires for some reason)

With the '21 Sahara, I would consistently get 21-22 mpg cruising just under 75 on the highway. I could have it loaded up with 4 people and cargo with 4 bikes hanging off the back and even have eSave/regen mode on.

With the '24 High Altitude, I can barely sniff 20 cruising at 65. Just completed a 750 mile road trip on I-90 from Boston to Rochester NY and back. One passenger with a little bit of luggage, cruising just under 75 the whole way. I got 16mpg overall!

While I expected a hit from the General AT's vs the Continental All-seasons, can that big of a difference possibly be explained by tires alone?

'24 Sahara 4xe got 24 MPG driving to Vermont and back, roughly 800 miles running the whole trip except the first 25 miles on gasoline. The Rubicon 4xe I traded in would have gotten around 20 MPG at 65 MPH.

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[MaskedRacerX]

Right, I understand. I just thought the 4xe claim to fame was some improved mpg like most hybrids. Is it only the short miles on battery power?

It does both, i.e., using battery + ICE for improved MPG, and can run for 20+ miles (we've seen as high as 28-29) on electric only. Generally speaking the ~15kWh of available battery isn't going to last long on the highway anyway, so it's not like being a hybrid means it'll get 27MPG on a 300 mile trip at 75MPH.

I'd say it's a little more tuned for that battery only mode and providing extra umph.

Speaking of, the battery + ICE system delivers significant extra power vs. the Wrangler with just the 2.0L (or even the 3.6L):

4XE
375 HP and 470 lb-feet TQ

ICE 2.0L I-4
270 HP and 295 lb-ft TQ

ICE 3.6L V6
285 HP and 260 lb-feet TQ

(Even with the weight difference, on the street, it's not even close ... )

And yes, even when you see the < 1% battery that does prevent running electric only, you still have that additional power from the reserve and it apparently takes a L O N G time to reach complete depletion - and keep in mind the EV system also regens. Heck, when we do a long drive, like taking it up to Savannah, the battery is gone up front, we do another couple of hundred miles without it, but that power kicks in as needed to pass, and then knocking around once we get to the city.

Running completely quiet is a fantastic perk too, cruising along over at the beach, just the ocean, sand squeaking, then having 470 lb-feet of torque on demand if the situation demands. Hunting, wanting to hit a trail and not make a ton of noise, it's very cool.

Plus now - at least some of us - get the killer option of having the Power Box, which was a fantastic backup during the last major storm here (ran the main fridge and made coffee that morning).

 

[alphawolff]

Right, I understand. I just thought the 4xe claim to fame was some improved mpg like most hybrids. Is it only the short miles on battery power?

Nope. It gives the worst MPG in the entire JL fleet in some scenarios. Worse than the 392 even.

 

[SAJN]

Nope. It gives the worst MPG in the entire JL fleet in some scenarios. Worse than the 392 even.

In my experience with three other hybrids, they hit their sweet spot driving around town. A lot of it obviously depends on how you drive and outside temps. If you want to drive like a Prius, you could probably get mid to upper 20's.

 

[Jeep Wick]

It does both, i.e., using battery + ICE for improved MPG, and can run for 20+ miles (we've seen as high as 28-29) on electric only. Generally speaking the ~15kWh of available battery isn't going to last long on the highway anyway, so it's not like being a hybrid means it'll get 27MPG on a 300 mile trip at 75MPH.

I'd say it's a little more tuned for that battery only mode and providing extra umph.

Speaking of, the battery + ICE system delivers significant extra power vs. the Wrangler with just the 2.0L (or even the 3.6L):

4XE
375 HP and 470 lb-feet TQ

ICE 2.0L I-4
270 HP and 295 lb-ft TQ

ICE 3.6L V6
285 HP and 260 lb-feet TQ

(Even with the weight difference, on the street, it's not even close ... )

And yes, even when you see the < 1% battery that does prevent running electric only, you still have that additional power from the reserve and it apparently takes a L O N G time to reach complete depletion - and keep in mind the EV system also regens. Heck, when we do a long drive, like taking it up to Savannah, the battery is gone up front, we do another couple of hundred miles without it, but that power kicks in as needed to pass, and then knocking around once we get to the city.

Running completely quiet is a fantastic perk too, cruising along over at the beach, just the ocean, sand squeaking, then having 470 lb-feet of torque on demand if the situation demands. Hunting, wanting to hit a trail and not make a ton of noise, it's very cool.

Plus now - at least some of us - get the killer option of having the Power Box, which was a fantastic backup during the last major storm here (ran the main fridge and made coffee that morning).

True, but you are forgetting etorque which adds 90 ft lbs to it's respective motor. 4xe will not last long with these figures if Fed subsidies go away.

 

[MaskedRacerX]

In my experience with three other hybrids, they hit their sweet spot driving around town. A lot of it obviously depends on how you drive and outside temps. If you want to drive like a Prius, you could probably get mid to upper 20's.

Yep, in general PHEVs are about using that plug-in-power-range to offset what might be a bit of worse overall MPG.

HEVs, like the small 48v systems in most new BMW ICE vehicles are so lightweight, they make a good contribution to improved power and MPG without the owner having to think about it.

And even another option, that will be an offering in the upcoming Scouts, is an EREV, where the drivetrain is connected only to the BEV system, and the gas motor is strictly a battery generator.

Some neat stuff, can't wait for the Scout, we put a traveler on reserve minutes after the reveal, pretty much as soon as we could (we didn't opt for the EREV, we're more than comfortable with a BEV).

 

[MaskedRacerX]

4xe will not last long with these figures if Fed subsidies go away.

Don't care, current one is on a 24 month lease, we'll be driving our Scout (or maybe an R1S or R2) after that

Until then, we're loving our second 4xe, on deck for a roof removal with this killer weather, it's 72° and sunny!

 

[Jeep Wick]

Don't care, current one is on a 24 month lease, we'll be driving our Scout (or maybe an R1S or R2) after that

Until then, we're loving our second 4xe, on deck for a roof removal with this killer weather, it's 72° and sunny!

Just pulled my hard top at lunch today!

 

[MaskedRacerX]

Just pulled my hard top at lunch today!

Nice!

We have two vehicles, so it's easy to leave it off and use the other car for (rainy day) backup, but we wanted to use the Jeep a little more over the holidays, so put if back on. Weather got a little too chilly (and some of that use was a couple of road trips).

But we're back in Jeep-as-the-secondary-ride mode, so yeah, got to get it removed. Had the panels out a few days recently since that's like 5 minutes.

 

[alpha1847]

Quick follow-up on original post - guess that single digit western NY weather was a bigger factor than I expected. Took a road trip from Boston to FL Keys. Despite cruising around 80mph for large stretches of I-95, averaged a more respectable 19mpg for the entire trip down. Still a far cry from the 21-22 I got in my '21 4xe Sahara, but much better than the 16 I got that started this. Towed a 3000lb Uhaul trailer on the way back and still got almost 16mpg!

 

[Wbino]

So, I had one of the earlier 2021 4xe's. It was a fully optioned Sahara. I traded in for a 2024 High Altitude, which is basically a fully optioned Sahara with all-terrain tires. Both had the same axle ratio with the LSD and the same size wheels and tires ('24 Sahara's have more narrow tires for some reason)

With the '21 Sahara, I would consistently get 21-22 mpg cruising just under 75 on the highway. I could have it loaded up with 4 people and cargo with 4 bikes hanging off the back and even have eSave/regen mode on.

With the '24 High Altitude, I can barely sniff 20 cruising at 65. Just completed a 750 mile road trip on I-90 from Boston to Rochester NY and back. One passenger with a little bit of luggage, cruising just under 75 the whole way. I got 16mpg overall!

While I expected a hit from the General AT's vs the Continental All-seasons, can that big of a difference possibly be explained by tires alone?

Winter grade fuel is the answer, as the weather warms up and they change gas your MPG's will go up.

 

[2019JLUS]

tires definitely make a HUGE difference

 

[alpha1847]

Right, I understand. I just thought the 4xe claim to fame was some improved mpg like most hybrids. Is it only the short miles on battery power?

If you do a lot of short trips around town, like I do, it can safe a lot of gas. On my '21 4xe, over half my total miles were in EV mode.

 

[MaskedRacerX]

Took a road trip from Boston to FL Keys.

Goddam, I bitch about the drive to the Keys from St. Augustine

 

[Dabrakeman]

One-off mpg comparisons are pretty useless. Routes taken, wind speeds, wind directions, grades, average vehicle speed, temperatures, tire pressures etc... all make huge differences so these discussions are rather meaningless unless you want to get truly scientific about it and set up your own statistically controlled tests (oh yea, like the US EPA does).

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