Jeep 392 MPG / Gas Mileage thread

[thexr6]

$1620 in CO
$250 deductible
clean driving record, no accidents or tickets
great credit
State Farm says it the testicles + HP + Smiles = Rates

392 annual premium : comp/collision/liability $655 per year $1000 deductible (!clean record, not too many speeding tickets )
$50 more than the 2021 GC Overland L (edit - forgot to mention Progressive w independent agent. Still best rates i can find and i check every renewal)

 

[Bhodi11]

I just hit 9000 miles on my 22XR and I am getting a whopping 9.5 mpg. I was averaging around 11.5 for the longest time then it seems to have taken a nose dive lately. Does not seem to matter at all how I drive it. Easy or hard the result is the same.

 

[Jeepstin392]

Just got home from a 300 mile trip.
Mix of city (20-45), highway (60-85), country roads (25-50) and about 30 miles of unpacked (15-25 mph).

Altitude ranging from 5800 (home) to 13.6k.
Temps ranged from 58°-98°
Humidity 17%-51%

Normal driving, no throttle jockey work.
Nitto 35” Terra grapplers set at 32 psi
Mobil 1, 0-40

Reset the trip & fuel
Overall average was 17.2

Live Display:
The highest I observed was 22, on cruise control at 55 and I think a slight down grade (hard to find “level” in Colorado)
Worst I saw was 8 mpg on the back roads and going up hill. A little throttle push and it dips below 6 mpg
Best I saw was 99, coasting downhill. Doesn’t count, but factors in to the overall average.

In the end, better than my 2012 JKUR ever got and better than most every other SUV or truck I owned. Except the GC SRT. Highway on eco and cruise would get about 22-24mpg

Fuel mileage can vary wildly
Too many factors and rough calcs show there can be as much as 30-35% variable in results.

Vehicle set up
Tires, psi, tread, age of tire, load range of tires (overall rolling resistance), exterior accessories, top off, top on, doors on/off. All will influence MPG

Weather
temps, humidity, barometric pressure, wind speed/direction, etc.

Motor oil: feel free to debate.
Age of motor, and, break in procedure
Programmer, tuner, intake, exhaust.

Can I get 8-9mpg? Sure. If I drive as I prefer.
Can I milk it and push to get closer to 20? Sure, if I try and don’t have traffic or a head wind.

After you’ve read all that, the short of it is, there are so many factors into an MPG, that unless you start developing a protocol and study the variables, you’re not winning any argument. At best, expressing opinions.

 

[stumblinhorse]

Just got home from a 300 mile trip.
Mix of city (20-45), highway (60-85), country roads (25-50) and about 30 miles of unpacked (15-25 mph).

Altitude ranging from 5800 (home) to 13.6k.
Temps ranged from 58°-98°
Humidity 17%-51%

Normal driving, no throttle jockey work.
Nitto 35” Terra grapplers set at 32 psi
Mobil 1, 0-40

Reset the trip & fuel
Overall average was 17.2

Live Display:
The highest I observed was 22, on cruise control at 55 and I think a slight down grade (hard to find “level” in Colorado)
Worst I saw was 8 mpg on the back roads and going up hill. A little throttle push and it dips below 6 mpg
Best I saw was 99, coasting downhill. Doesn’t count, but factors in to the overall average.

In the end, better than my 2012 JKUR ever got and better than most every other SUV or truck I owned. Except the GC SRT. Highway on eco and cruise would get about 22-24mpg

Fuel mileage can vary wildly
Too many factors and rough calcs show there can be as much as 30-35% variable in results.

Vehicle set up
Tires, psi, tread, age of tire, load range of tires (overall rolling resistance), exterior accessories, top off, top on, doors on/off. All will influence MPG

Weather
temps, humidity, barometric pressure, wind speed/direction, etc.

Motor oil: feel free to debate.
Age of motor, and, break in procedure
Programmer, tuner, intake, exhaust.

Can I get 8-9mpg? Sure. If I drive as I prefer.
Can I milk it and push to get closer to 20? Sure, if I try and don’t have traffic or a head wind.

After you’ve read all that, the short of it is, there are so many factors into an MPG, that unless you start developing a protocol and study the variables, you’re not winning any argument. At best, expressing opinions.

OMG you are running Mobil 1 in a 392. That is blasphemy. Next you are going to post that you don’t run 93 octane. And sometimes not even 91!

 

[Jeepstin392]

OMG you are running Mobil 1 in a 392. That is blasphemy. Next you are going to post that you don’t run 93 octane. And sometimes not even 91!

Actually, I piss in the radiator of every vehicle I own. It’s like unicorn juice and keeps the engine runnin’ hot!

 

[stumblinhorse]

Actually, I piss in the radiator of every vehicle I own. It’s like unicorn juice and keeps the engine runnin’ hot!

Mile high unicorn juice no less.

 

[Jeepstin392]

Mile high unicorn juice no less.

Absolutely
generated from homemade vino

 

[stumblinhorse]

Switching to Geico today. And back on topic. Read’em And weep boys…. Never reset my mileage under 18mpg unless full time 4WD was involved.

 

[dgerb]

So... While doing about 500 miles of break-in driving around town for a week or so after picking up my 392 in May 2021 from Parkway CDJR in Clinton Michigan (630 ft elevation), I experienced slightly over 20 MPG upon my first complete fill up. I was shocked when I reached 200 miles on my first half of a tank and hought the fuel gauge was malfunctioning. During my drive home to Arizona I achieved similar gas milage until I started gaining altitude and losing the availability of 93 Octane fuel when I hit New Mexico and beyond. The milage at that point was reduced to about 18 MPG on the highway. Upon reaching home in Arizona at about 4500 feet and running around town for a couple of weeks or so the average turned to about 16 MPG all while on the stock 33" tires. After installing 37" KM3s and a Tazer to adjust for the tire size change on the Jeep I have been averaging about 13.5 MPG here at 4500 ft on 91 octane and it has not improved since the tire and wheel swap over a year ago. Just my $.02 worth.

I'm at 4500 ft in Arizona also...getting around 12.6 mpg around town (granny mode)...sitting on 37's (Tazer adjusted) and stock 3.73 gear ratio...

 

[stumblinhorse]

I am running Toyo 35s at 30 psi with 3.73s stock gearing.

 

[computertom]

Switching to Geico today. And back on topic. Read’em And weep boys…. Never reset my mileage under 18mpg unless full time 4WD was involved.View attachment 6551

This is very impressive and a bit of a bummer for you. You’re likely missing out on so much fun that this thing has to offer when you breath a bit heavier on that pedal on the right…

All kidding aside, I’ve attempted to break 20 a few times on road trips and cannot ever get over that hill.

 

[Jeepstin392]

This is very impressive and a bit of a bummer for you. You’re likely missing out on so much fun that this thing has to offer when you breath a bit heavier on that pedal on the right…

It’s like having a hot girlfriend and not… never mind.

 

[Jeepstin392]

I’ve never had a Jeep that likes going up hill while getting reasonable gas mileage...
19.9 mpg first fill up while pulling passes no fuel additives..
19 mpg while running 300-500 mile break in with fuel additive..

we’re just over the 500 mile mark at this point, I had a feeling the Jeep had the potential to get decent mileage.


I used to use Envio Max Plus for years, its actually a Fuel catalyst..
as far as I know it’s no longer on the market..

Ive been using Maxx Fuel supplement, 1 oz treats 30 gallons..

to each your own, some people like fuel additives others don‘t, I feel I’m getting good results as I can tell when I don’t use it..

since the subject changed to insurance rates, how’s $435.06 per 6 months grab ya... USAA with all the usual qualifications..
although high deductible..

I’m dreading the vehicle registration next month, good old state of Colorado really sticks it to ya these days...

I think I paid over $1900 for Colorado registration.

 

[stumblinhorse]

You all are so right. I put a raw egg under the go pedal and make sure I never break it. That is how you get almost 20mpg…. If you see my insurance agent and police make sure that you tell them there is no way I could get that kinda mileage and speed or drive aggressively at all…

 

[XRecon]

Driveway to driveway road trip to La Conner, Washington, 18.0 mpg.
Driveway to driveway road trip to Destin, Florida, 17.5 mpg.
Both trips only state and US highways, no interstate highways at all using cruise control between towns.

 

[Bman03]

I get 10.6 MPG because I drive it however I want.

Love to hear the exhaust and hitting the gas at stop lights.

Got 35 toyos on 3.73 gearing.

Didn’t buy it for the gas mileage-

I have a rivian suv on order and will get it if I want better mileage.

 

[@JC]

Most recent trip mpg screenshot, 323mi round trip 99.9% Interstate with the cruise set at 85mph, slight headwind on the way out, no wind on the way back and mostly flat both ways. I'm actually pretty impressed with that MPG for a lego brick at 85.

 

[FccinAZ]

A little over 1000 miles and I just increased to 10.5 mpg. It’s the XR and always on off-road+ because I hate the drone of 4-cylinder mode. I laugh when my range with a full tank is calculated to be less than the range on my Mache-GT. The Mache is a little quicker, but it doesn’t have that intoxicating sound. I always mention the other car when people come up to talk about the car I’m driving to confound the tree huggers and coal rollers.

 

[LTZ470]

One thing to remember...if you put 3 fat girls (~900 lbs) in your Wrangler 3.6 or 3.8 (Had both) you would lose mucho fuel mileage...at almost a 1000 lbs more and higher in stance the Jeep 392 does fairly well I got 15.7 average yesterday 300+ miles from Lake Charles to DFW...all I-10 and I-45...80-83 mph all the way in windy conditions...JK 3.8 I had with a Magnuson Supercharger would be much the same and required premium as well...all in all 392 is doing very well on fuel, yes a larger fuel tank would be great! even an additional 5 gallons...
Weight kills fuel mileage...392 is heav(ier) than the norm....And of course Jeeps are like holding up a 4X8 sheet of plywood and running against the wind as well...

 

[AZ392]

@900 miles now, so enjoying FULL RPM range and paddle shifting! I get about 12.4 MPG by the computer calcs, and only about 250 miles per tank on 91 oct here in AZ. If I drive like a granny it gets much better but that’s no fun. I have not been able to drive a full tank like granny yet, just can’t keep my foot out of it. I don’t really care about the fuel milage but I do wish it had a larger tank! So I read earlier in this thread that off road + locks out the 4cyl mode…I don’t like the sound of 4cyl mode either…but does the OR+ mode do anything else?