JT owners post your MPG

[pmoney$]

once i reconfigured the computer for my tire size i get about 17.5 combined.

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[BAT]

My wife used to ride with a friend from Iowa to Florida where her quilting friend had a condo. They drove down and drove back. I made her friend think hard one time when I told them that they'd get a lot worse mileage coming back since it was all up......... easy going down to Florida, a bit more work coming back up to Iowa. Then she caught on.

I'm thinking I might need to look up that thread that had a tweak for easy on off soft top. In the city or down at the beach I don't have any issues with it but man going down the interstate with the top down it was creating some drag which was very noticeable while driving. If gonna be interstate driving or tollway then just take the whole thing off and pop it in the bed of the truck

 

[ShadowsPapa]

I'm thinking I might need to look up that thread that had a tweak for easy on off soft top. In the city or down at the beach I don't have any issues with it but man going down the interstate with the top down it was creating some drag which was very noticeable while driving. If gonna be interstate driving or tollway then just take the whole thing off and pop it in the bed of the truck

My best MPG is top fully on. I note a bit of a drop, and can actually feel the drag, with the hard top off.
I didn't think of it at first, but twice I've had the top off and driven it a few times with it off, and noticed more drag and lower mpg on the same roads I usually drive.

 

[brianinca]

We came south down I5 yesterday, can confirm above 80 MPH the indicated instant MPG drops to 14 or lower....

 

[Gladiatrix]

So does it make any sense that my brand new Rubicon with 1000 miles on it is getting 11.9-12.1 currently. Both city and highway driving. I thought it was rather low but after reading everyone else's from 14-18mpg I feel like something isn't right.

Maybe not enough miles driven to accurately calculate yet?

 

[TheHime]

So does it make any sense that my brand new Rubicon with 1000 miles on it is getting 11.9-12.1 currently. Both city and highway driving. I thought it was rather low but after reading everyone else's from 14-18mpg I feel like something isn't right.

Maybe not enough miles driven to accurately calculate yet?

Yes, it takes time for your motor to brake in. I think around 3k it should start averaging out.

 

[homerun]

So does it make any sense that my brand new Rubicon with 1000 miles on it is getting 11.9-12.1 currently. Both city and highway driving. I thought it was rather low but after reading everyone else's from 14-18mpg I feel like something isn't right.

Maybe not enough miles driven to accurately calculate yet?

stock JTR, no lift, and OEM tires? I think you have something wrong. Unless you drive up hill and into the wind both ways or don’t know how to shift your 6spd. Sure there are countless variables to MPGs but I think your results are too far outside the standard deviation.

disclaimer: I am not a mechanic, just some guy on the internet with an opinion.

 

[unsocbl]

21.7 with mostly 2 lane country roads at 50-60 mph. Happy with it as my 2017 recon on the same roads averaged about 17.5 (stock tires.

 

[ShadowsPapa]

Yes, it takes time for your motor to brake in. I think around 3k it should start averaging out.

The engine is actually broken in within a couple hundred miles. Things do loosen up, but to really see the impact you're going to go about 8,000 miles. That's been the general "rule of thumb" since I first got into new cars in the 70s.

OP -
Mine really gained in mpg at about 7-8,000 mark. In the case of modern engines, the thing actually learns as it goes, so the "computer" or powertrain control module as we used to call them in the 90s learns and adapts.
That coupled with the wearing in of parts (some still call it break-in although that's done quickly) you gain with thousands of miles.

Also speeds of over 65 really kill the MPG on a tall brick like the JT.

 

[ShadowsPapa]

stock JTR, no lift, and OEM tires? I think you have something wrong. Unless you drive up hill and into the wind both ways or don’t know how to shift your 6spd. Sure there are countless variables to MPGs but I think your results are too far outside the standard deviation.

disclaimer: I am not a mechanic, just some guy on the internet with an opinion.

I also believe that in modern vehicles, the stick no longer has the same edge over automatics it used to have. Modern transmissions are programmed - no human is going to drive a stick for best mpg - they bought a stick because it's sporty - not to drive like my mother did with her old postal Jeep (although my brothers and I always teased her about seeing her in town taking corners on two wheels)

The way I normally drive my 5 speed car - I don't get top mpg - I have to revert back to my non-sport mode of driving and watch the tach and listen closely for the sweet spots (or have my wife sitting in the other seat - that increases mpg instantly)

 

[Lateralus]

At only 200 miles on my JT I was getting 19-22 mpg withing the first couple of weeks and stayed consistent until I added 35's. Now Iam getting 17.5 to 18 mostly city on 35's with 3.73 gears and 8 speed with corrected speedometer. So Iam not sure if the "break in period" theory holds much truth. Iam at about 4000 miles as of this week.

 

[Mac]

Brand new, Max tow all stock, 21.1mpg hand calculated. About 250 miles of that was highway with some elevation cruise set at 75, I am impressed.

 

[ShadowsPapa]

At only 200 miles on my JT I was getting 19-22 mpg withing the first couple of weeks and stayed consistent until I added 35's. Now Iam getting 17.5 to 18 mostly city on 35's with 3.73 gears and 8 speed with corrected speedometer. So Iam not sure if the "break in period" theory holds much truth. Iam at about 4000 miles as of this week.

Mine was doing easily 19-21 (sometime more than that) when I first got it.
Since I've added the miles, the standard is now a good 2 mpg over that.
My wife helped a friend move from one city to another, 3 trips combo driving and she came back with 24 mpg on the cluster - with the truck LOADED, back seat stuffed side-to-side, floor to roof, box loaded with boxes of stuff.

You aren't anywhere near the miles where it could jump up more.
You are supporting my contentions, actually.
You say you got 19-22 right off the bat - so did I!
It's not so much break-in but is wearing in of the parts AFTER initial break-in - AND, the PCM learning and adapting. You aren't there yet.
EVERY NEW VEHICLE I've ever owned, dating back to my first NEW car, an AMX, in the 1970s, through my 87 Comanche, at least 6 or more Grand Cherokees, Ford F250, Silverado, all of them, the mpg increased with miles and took the biggest jump between about 8,000 and 10,000 miles.
My wife's current Grand Cherokee with 3.6 was doing well at 23-24 for the first few thousand, now 25 and more is routine - she's hit 27 once, but it's mostly 25-26 now in mixed driving.
The biggest jump - came after she hit over about 9,000 miles.
Fits what I've seen.

And of course, it all really depends on the person behind the wheel and where they live and how they drive.
Someone else could take my truck and top out at 20, my wife may drive it and get an easy 25 or 26 out of it as a routine. My youngest son might get 15 out of it.

 

[DreamedofaJeepSomeday]

I also believe that in modern vehicles, the stick no longer has the same edge over automatics it used to have. Modern transmissions are programmed - no human is going to drive a stick for best mpg - they bought a stick because it's sporty - not to drive like my mother did . . .

Not so for me - I like that I can drive sporty when I want to, but the rest of the time I drive very smoothly with a light foot. That is part of the beauty of driving manual. I enjoy different ways of driving different times. Getting high MPG is sort of a challenge.

Right now I have the MPG front and center on my instrument panel. I experiment with different gears at commonly driven speeds, watching how RPM, speed, and MPG interrelate. The instantaneous MPG usually hovers 28-32 MPG on level roads and constant speeds of 45-55 MPH.

I have not yet reset the MPG since taking delivery of the truck one month ago. It had 16 mi. on the odometer when rolled up to the showroom. The running average goes down to 18 after I have sat still for an hour running AC during lunch break, goes up to 19+ while on my commute of 21 mi one way (mostly "city"), goes up as high as 21 when I drive 35 miles to the next town and back on Interstate.

 

[BAT]

My best MPG is top fully on. I note a bit of a drop, and can actually feel the drag, with the hard top off.
I didn't think of it at first, but twice I've had the top off and driven it a few times with it off, and noticed more drag and lower mpg on the same roads I usually drive.

Yes same I notice some drag with the top off but I guess that would be normal but if you have a soft top and the bun is sitting up top you can really feel it on the freeway.

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