sunvalley
Member
24’ 392. Around 4,000 miles mostly in town and local highway. No issues yet, 16.5 mpg so far
At the risk of being boo'ed to "Bolivia", how many miles do you have? Problems? Mpg?
- Thread starter rocketman
- Start date
Willhonkforparts
Active member
Man, I don't understand how anyone averages more than 13mpg. I'm about 1500 miles into my 2024, and am averaging about 12mpg overall. Being really nice to it, I can average 14ish for short periods, but rarely any more than that
guruman
Well-known member
- Nov 16, 2022
- 1,568
- 3,109
- Current Rides
- 2023 Rubicon 392 20th Anniversary Edition, 1996 M1078 rolling fortress
Both stop-and-go, and high speeds just kill our MPGs. Running errands around town, and blasting down the interstate at 80 mph, both get me about 12mpg.
But 55mph on a long stretch of 2-lane with no stops.... and I see 15-16 pretty regularly.
Infidel09
Active member
2021 Non XR with 37s averaging 13 mpg... I have the pedal commander, lift, mid muffler delete etc...
Attachments
Uncommon Sense
Well-known member
22XR. Two years of ownership at end of May. 27k miles. Daily driver. No off-roading beyond a gravel country road a few times a year.
I've just changed oil and rotated tires every 6k miles.
The only "issue" I've experienced is leaking gas tank as I am only getting 9mpg in city (real city driving, not suburbs). Dealer swears there is no hole in tank. LOL. I do average about 16 on extended highway road trips though. I've hit 17.5 a few times. Drove to Chattanooga from Chicago two weeks ago for Spring Break and averaged 16.
Seriously, the only issues I've experienced is a weird burning / fishy smell when heat was on the first winter I had it. Happened maybe two or three times randomly. It thought it was a leaky heater core or coolant leak. It seemed to burn itself off and never returned. Never even made it to dealer and haven't had issue since.
The OEM battery seemed to have a bad cell of some sort. We had a cold snap back in January with temps down to around -15 degrees overnight. The Jeep barely started and gave off a low voltage warning that I couldn't use aux switches until battery charged. The battery never seemed to recover and I'd get the low voltage warning maybe 50% of the time when i started Jeep. I replaced the battery two weeks ago and it is all good.
I've noticed a very light brake squeal when backing out of garage now after jeep sits over night at goes away almost immediately. I'll get that checked out as I'd be surprised brakes/rotors need replacing after 27k miles but maybe the 35s wear them out quick.
That's it. It's been very reliable.
I've just changed oil and rotated tires every 6k miles.
The only "issue" I've experienced is leaking gas tank as I am only getting 9mpg in city (real city driving, not suburbs). Dealer swears there is no hole in tank. LOL. I do average about 16 on extended highway road trips though. I've hit 17.5 a few times. Drove to Chattanooga from Chicago two weeks ago for Spring Break and averaged 16.
Seriously, the only issues I've experienced is a weird burning / fishy smell when heat was on the first winter I had it. Happened maybe two or three times randomly. It thought it was a leaky heater core or coolant leak. It seemed to burn itself off and never returned. Never even made it to dealer and haven't had issue since.
The OEM battery seemed to have a bad cell of some sort. We had a cold snap back in January with temps down to around -15 degrees overnight. The Jeep barely started and gave off a low voltage warning that I couldn't use aux switches until battery charged. The battery never seemed to recover and I'd get the low voltage warning maybe 50% of the time when i started Jeep. I replaced the battery two weeks ago and it is all good.
I've noticed a very light brake squeal when backing out of garage now after jeep sits over night at goes away almost immediately. I'll get that checked out as I'd be surprised brakes/rotors need replacing after 27k miles but maybe the 35s wear them out quick.
That's it. It's been very reliable.
- Thread starter
- #46
You guys are my inspiration. I am under 1k into ownership and mixed am getting 11 and thats me being pretty gentle. I am going to just tell myself its a break in thing and I will be seeing your type of numbers soon. lol
Yep I get the same as uncommon sense does
- Thread starter
- #48
You guys have to be Flintstone pedaling at times! Its the only answer!
DCWarGames
Active member
100% agree. Reset one of the trips (I've kept trip A running since mile 8 for "engine hours") and verify again. I'm able to consistently achieve up to 16.2 in most "average" cases on my daily commute which completely wide open highway in the AM and bumper to bumper for 40 minutes in the PM.
I documented this in another post but the biggest thing to note is the MPG drop after 2k rpm. 65-68 seems to be the most efficient speed provided stock tires/gearing/load etc etc.
The first 2 weeks I owned my 392 I saw 152 mile range on a full tank
so.. I get it lol.
CAMEL2R
Army Veteran
Bought mine last August with 6k miles, it now has just shy of 19k. Only issue was the rear locker needs service error. Came on every time I forced 2wd, but my Jeep guru fixed it for good using the Tazer by-pass module. MPG...never look, I fill her up when empty, done. Change the oil every 4k miles. Happy! 
Last edited:
Infidel09
Active member
I only have 20k miles on my Jeep, but the 392 motor has been out for so many years I dont worry about the reliability of it as long as you take care of it. I havent had any issues at all....your engine is still new and after it breaks in youll get 13 mpg..enjoy it - there are a lot of people out there that would love to have one.
Mandrake
Well-known member
Cool Thread.
Mine is a 22, XR with approximately 3300 miles. We don't drive it in the salt. Getting it dialed in for riding, new Hellwig sway bar, running 30psi in front & rears. I like the 30 psi for the fronts, feels well planted.
It's cool, haven't taken it on a long trips yet, just some out and backs of 50 miles or so.
If longer trip, Gladiator is the one you want to take. It rides very well, longer wheelbase, stiffer Mojave springs and Fox shocks. Kinda wish I had the Fox shocks on the 392.
With 4.56, it will never get great fuel mileage (unless I stay below 55 )
It runs good and is quieter now since I got rid of that bogus drone out of the sub. The sub is only for music now, as it should be.
In July will have had it two years . I 'm the only one to change the oil in it.
Mine is a 22, XR with approximately 3300 miles. We don't drive it in the salt. Getting it dialed in for riding, new Hellwig sway bar, running 30psi in front & rears. I like the 30 psi for the fronts, feels well planted.
It's cool, haven't taken it on a long trips yet, just some out and backs of 50 miles or so.
If longer trip, Gladiator is the one you want to take. It rides very well, longer wheelbase, stiffer Mojave springs and Fox shocks. Kinda wish I had the Fox shocks on the 392.
With 4.56, it will never get great fuel mileage (unless I stay below 55 )
It runs good and is quieter now since I got rid of that bogus drone out of the sub. The sub is only for music now, as it should be.
In July will have had it two years . I 'm the only one to change the oil in it.
Fast-n-Furious
Well-known member
How big of a difference does the Hellwig anti-sway bar make? I’ve heard good things about it. Some members also pointed out it restricts the rear articulation at full flex.
caraholic
Well-known member
I don’t use it for off-road but it is well worth the money for on road. It’s a very noticeable difference.
Mandrake
Well-known member
Yeah I agree with Caraholic. The Hellwig eliminates that side to side sway going down the highway. If you compare the Hellwig to the stock sway bar, you will see the stock one is unbelievably small. I think I can bend that stock one, but you cannot bend the Hellwig.
I can see you would need to disconnect the Hellwig if rock crawling. I doubt it gives much and would pick up a wheel. I have some disconnect sway bar end links I may start using. They look pretty good.
I Had a Hellwig on my 2016 JK, it was great there as well. So I ordered one for the JL, it really does help the softie shocks on a Rubicon.
Have a good one!
Fast-n-Furious
Well-known member
Thanks for the feedback. I've swapped the factory coil sprints with Clayton coils which have higher spring rates. I can already feel the difference. The Hellwig rear anti-sway bar should further improve the on-road handling. I remember @At Risk Ute installed both, can you weight in and share your feedback too?
Create an account or login to comment
Join now to leave a comment enjoy browsing the site ad-free!
Create account
Create an account on our community. It's easy!
Log in
Already have an account? Log in here.
