Gas mileage is concerning..

[chsapeak]

I've got 37's on my JT gasser with 4:10 rears.. I get 14.3 "mixed driving" and 16.4 long highway runs at 75 mph

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[redrider]

Too many variables on city stop and go driving. How much time idling, jack rabbit starts and stops, personal driving habits.

Just let it be said, your worst fuel consumption is on city streets. Even with the ESS active you're still going to have a lower average versus highway/interstate driving.

The so called jack rabbit start is no longer an issue. The problem was carburetors with accelerator pumps and overly rich metering. EFI these days is much more economical with acceleration.

 

[JerseyMark]

As others have said, I noticed an improvement in mpg after engine break-in.
Also, I find that the ESS Lowers my mpg by about 1. I know it may not make sense, but I consistently observe this when using ESS. I do have a manual trans if that makes a difference.

 

[MCATDT]

I'm sorry I don't mean to come off wrong but I continue to be amazed at so many discussions about MPG and who gets what, and who's disappointed in the fuel economy. I never entered into the Jeep world (JK nor JT) with any thought about MPG. I was buying a capable vehicle to enjoy wherever it could take me. Its a rolling box with an imperfect power plant. That said it does exactly what it was designed to do. If you didn't buy it for that purpose then I can see why you would be disappointed in MPG. For me I don't care how much gas I have to put into the tank to get there as long as I do, and that place is usually scenic and off the beaten path. By the way since you asked 15mpg and loving every minute of it. Enjoy the ride you have one of the most unique vehicles around. Make it your own and have fun with it.

 

[Trickster]

I'm sorry I don't mean to come off wrong but I continue to be amazed at so many discussions about MPG and who gets what, and who's disappointed in the fuel economy. I never entered into the Jeep world (JK nor JT) with any thought about MPG. I was buying a capable vehicle to enjoy wherever it could take me. Its a rolling box with an imperfect power plant. That said it does exactly what it was designed to do. If you didn't buy it for that purpose then I can see why you would be disappointed in MPG. For me I don't care how much gas I have to put into the tank to get there as long as I do, and that place is usually scenic and off the beaten path. By the way since you asked 15mpg and loving every minute of it. Enjoy the ride you have one of the most unique vehicles around. Make it your own and have fun with it.

Exactly!

 

[dcmdon]

Not me...I can't stand tailgaters and usually leave about 6 - 10 car lengths in front of me while on the interstate.
It just seems logical, that if you are tailgating, you are using more brake and gas to maintain your position, whereas if you leave ample space in front of you, it provides a greater margin to allow for coasting where brakes are not necessary.
Sure it's a brick on wheels, but I would wager any day of the week that any benefit you are getting from wind drifting the guy in front of you is lost and outweighed by the additional braking and gas.

There is no doubt that tailgaiting on the highway will save you gas. That's one of the things that hyper milers do. Its proven to work.

But I would never do it. I drive fast but dont' tailgate. And I don't like tailgaters. If you crawl up my ass when I'm in the right lane you will get a surprise.

 

[DBravo]

So I have a new JT overland and the gas mileage is not impressive. I've mainly drove in the city but really short commutes. Farthest I've taken it on the highway is maybe about 15 miles. Right now it's showing me my average is 14.3 mpg. Is this standard? Everything I've read has said it should be about 17 city, 23 highway. This is my first Jeep, so maybe this is just expected lol. But curious to see what other's have experienced!

2020 JT Overland - all stock except Bestop Sunrider added for the summer. 29,000 miles and some 1500 mile trips. Still averaging 22.8mpg - standard 87 octane. I drive between 65-70 on the hwy.
Just bought a new 2021 Wrangler Sahara (6 cyl auto) for my wife. At 892 miles she is averaging 14 mpg with all short drives, very little hwy. I would expect the average to climb once we take a few trips in it. The 6 cylinder is a strong motor and pretty efficient.

 

[ResurrectionManNH]

22-23 city, 25-26 highway with the diesel with 33s and leveling kit. Huge torque and mid size car gas mileage = win to me.

 

[redrider]

My YJ, 4.0, 5 speed manual was very consistent at 17 MPG. 2 inch body lift with those huge for the time 33's. City or highway up to 70mph. The 3.6 may be a bit more efficient by making do with less displacement but it still requires a specific amount of torque to perform the same amount of work and that requires an almost set in stone fuel-air ratio. Diesel will do better because the fuel converted to heat/power is at about 50%. When that V6 revs higher, it consumes fuel at a faster rate. Supply and demand. My 2c.

 

[Chefpeople]

I averaged 30MPG on the highway before adding my tire upgrade. I am now at 26MPG. I have the Diesel Engine.

 

[maddocmuc]

So I have a new JT overland and the gas mileage is not impressive. I've mainly drove in the city but really short commutes. Farthest I've taken it on the highway is maybe about 15 miles. Right now it's showing me my average is 14.3 mpg. Is this standard? Everything I've read has said it should be about 17 city, 23 highway. This is my first Jeep, so maybe this is just expected lol. But curious to see what other's have experienced!

So I have a new JT overland and the gas mileage is not impressive. I've mainly drove in the city but really short commutes. Farthest I've taken it on the highway is maybe about 15 miles. Right now it's showing me my average is 14.3 mpg. Is this standard? Everything I've read has said it should be about 17 city, 23 highway. This is my first Jeep, so maybe this is just expected lol. But curious to see what other's have experienced!

that is very poor. Diesel or gas?
i get 21 mpg @ 93 mph (german autobahn, diesel engine).

So I have a new JT overland and the gas mileage is not impressive. I've mainly drove in the city but really short commutes. Farthest I've taken it on the highway is maybe about 15 miles. Right now it's showing me my average is 14.3 mpg. Is this standard? Everything I've read has said it should be about 17 city, 23 highway. This is my first Jeep, so maybe this is just expected lol. But curious to see what other's have experienced!

 

[NightFog]

With the wind to my back, going down hill at maybe 40mph, I might get 23, other than that the best I've gotten is 16.4

 

[alpineovernappa]

I get a computer output (hand calculated verification) of 32mpg average for mine with my RTT on top and about 400 lbs of gear in it… but my engine makes a real clackity clack noise all the time

 

[ShadowsPapa]

Is the in car average known to be accurate?

Depends. I've used FillUp app on my phone and sometimes the truck is a few tenths high, sometimes it's spot-on, and a couple of times the app said it was higher than the cluster showed.
In the long run, over a year, I'm thinking mine will be close, maybe read a tenth or two high over several months based on observations so far.

 

[ShadowsPapa]

2020 JT Overland - all stock except Bestop Sunrider added for the summer. 29,000 miles and some 1500 mile trips. Still averaging 22.8mpg - standard 87 octane. I drive between 65-70 on the hwy.
Just bought a new 2021 Wrangler Sahara (6 cyl auto) for my wife. At 892 miles she is averaging 14 mpg with all short drives, very little hwy. I would expect the average to climb once we take a few trips in it. The 6 cylinder is a strong motor and pretty efficient.

Yeah, give it time to LEARN and loosen up a bit. Mine climbed (until the dealer flashed it - then it started over learning)
A/T tires make a big difference. The dealer told me they would, and I've proven it on mine by switching back and forth over the last couple of years.
I do 21 typical driving, 18-19 with my wife driving at over 70 trying to get home fast.
Speed MATTERS on these things more than most due to the shape. Face it, it's a BRICK. And the fact I have to clean bugs off the skid plate and suspension and steering should tell us something - wind catcher down there.

Still, my 20+ most of the time is better than my WJ at 19 and my Silverado 12 14 or so. I DID hit 20 on my Chevy doing a steady 55 but that was one time.

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