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MPG and range

jeepncrowd

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So I want to start a new thread where those who have upgraded their JT's to larger than factory sized tires can post their MPGs and range. Though those running completely stock or just with nonfactory tires/wheels should also post. It will be a one stop thread for all info regarding this subject. Should also prevent recurrent, "What's you MPG?" questions.
I know Smiles per Gallon etc. I get it. I actually don't care about the financial part that much. My reasoning is I plan to use this for an overland vehicle. I have an ecodiesel WK2 that I love the range on. So I'm really trying to decide (like many are) is the increased power and range of the diesel, but likely worse (though still unkown) reliability of the gen 3 ecodiesel, worth waiting for compared to the decreased range and power of the gas engine (though more history showing good reliability).
I plan on doing a lot of cross country trips on 37"s with gear, so If I'd getting a range of less than 300-350 miles with the gasser, but >400 with the diesel then it's worth it ( assuming both have 22 gal tanks).
This is not to debate on merits of gas vs diesel (cost, reliabilty etc.). This is to give myself and those wanting to run larger tires an idea of what to expect. And potentially the MPG/Range difference is between gas or diesel (once released).
Pictures are highly encouraged.

I'd like it to be fairly standardized.
Jeep year & trim: (Rubicon, Overland, Sport)
Mileage: (XXXXX)
Engine: (3.6 pentastar, 3.0 ecodiesl, Future options)

Fuel type: ( 87 octane, 89 octane, biodiesel, etc)
Lift: (stock, Mopar 2", Metalcloak 3.5, etc)
Tire size and model: (37x12.5R17 Nitto Trail Grapplers)
Diff gearing: (3.73, 4.10, 4.88 etc)
Tuned?: (yes/no which ones)
Other add-ons: (Supercharger, aftermarket turbo, CAI, etc.)
Tire PSI: ()
Speedometer recalibrated? (yes/no)
EVIC or hand calculated?:
Local driving conditions: ( Flat, hilly mountains, sea level, altitude, towing, highway, city)
Average MPG:
Anything else of interest.
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WXman

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So far my Gladiator is getting significantly worse fuel mileage than my JLU. Kind of makes me paranoid to put my 35 back on it.

I saw 18 avg with 35s on the JLU. The JT is doing 17 stock. Ouch. I hope she breaks in and gets better than this.
 

Pat2Alaska

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Rubicon LE, stock suspension for now, 315 70R 17 BFG K02s on Ion 171 17”x9” wheels (5), Warn winch plate, SmittyBuilt X20 12,000 winch. Vehicle weight with spouse & me 5,600lbs.
B2C7EE5A-2235-430C-BEC7-3EAC5D194C86.jpeg
2FCE4265-F489-4F6F-9942-6323544D2FC3.jpeg
0A9A4A0F-4A00-4FF1-9363-D401DC58D54D.jpeg
D78A3F57-5FBA-4B45-BDCA-CF296CFFBBB8.jpeg
C9B46E36-2EF7-4AC3-BFEC-20142F1EC32D.jpeg
My last tank of fuel (2/3rds) was a mixture of flat, rolling hills, with & without wind, 60MPH on hwy and about 10% city driving. First 115 miles mostly flat and half of that with very little wind, over 20MPG, see pix. Last half of the miles was some city driving & strong headwind/sidewind on the highway. 18.4MPG avg for 229 miles. 95% of the time Sunrider closed, windows up and A/C on. Just a small snippet but I can tell you from no wind to 20MPH head/side wind I’m seeing 6 or more MPG delta! Not unexpected.
 

Pion

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The highway mileage kills - especially speeds above 65 or 70. In Montana where I'm at the speed limit is 80, and doing that speed my stock LE got in the 15's. Going around town I was able to do between 18 and 19 but as soon as I jump on the highway it drops.
 

Reasons

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For some reason those 35s seem slightly larger than most 35s I've seen. Could just the be the angle of the photo. Love the setup. Congrats!

Rubicon LE, stock suspension for now, 315 70R 17 BFG K02s on Ion 171 17”x9” wheels (5), Warn winch plate, SmittyBuilt X20 12,000 winch. Vehicle weight with spouse & me 5,600lbs.
B2C7EE5A-2235-430C-BEC7-3EAC5D194C86.jpeg
2FCE4265-F489-4F6F-9942-6323544D2FC3.jpeg
0A9A4A0F-4A00-4FF1-9363-D401DC58D54D.jpeg
D78A3F57-5FBA-4B45-BDCA-CF296CFFBBB8.jpeg
C9B46E36-2EF7-4AC3-BFEC-20142F1EC32D.jpeg
My last tank of fuel (2/3rds) was a mixture of flat, rolling hills, with & without wind, 60MPH on hwy and about 10% city driving. First 115 miles mostly flat and half of that with very little wind, over 20MPG, see pix. Last half of the miles was some city driving & strong headwind/sidewind on the highway. 18.4MPG avg for 229 miles. 95% of the time Sunrider closed, windows up and A/C on. Just a small snippet but I can tell you from no wind to 20MPH head/side wind I’m seeing 6 or more MPG delta! Not unexpected.
 

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Hurley82

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Rubicon LE, stock suspension for now, 315 70R 17 BFG K02s on Ion 171 17”x9” wheels (5), Warn winch plate, SmittyBuilt X20 12,000 winch. Vehicle weight with spouse & me 5,600lbs.
B2C7EE5A-2235-430C-BEC7-3EAC5D194C86.jpeg
2FCE4265-F489-4F6F-9942-6323544D2FC3.jpeg
0A9A4A0F-4A00-4FF1-9363-D401DC58D54D.jpeg
D78A3F57-5FBA-4B45-BDCA-CF296CFFBBB8.jpeg
C9B46E36-2EF7-4AC3-BFEC-20142F1EC32D.jpeg
My last tank of fuel (2/3rds) was a mixture of flat, rolling hills, with & without wind, 60MPH on hwy and about 10% city driving. First 115 miles mostly flat and half of that with very little wind, over 20MPG, see pix. Last half of the miles was some city driving & strong headwind/sidewind on the highway. 18.4MPG avg for 229 miles. 95% of the time Sunrider closed, windows up and A/C on. Just a small snippet but I can tell you from no wind to 20MPH head/side wind I’m seeing 6 or more MPG delta! Not unexpected.
Is your JT calibrated for the larger tires?
 

uplandgunner

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JT Rubicon, Stock 33's, steel XRC bumper with X20 10,000 winch so an added 140 lbs. First 1500 miles I was avg. 14-15 and then things changed and mpg steadily increased avg. 19.5 now at 3400 miles. Mix of towing an 2000 lbs boat some heavy payloads and about an equal mix of Hwy to city miles. Mpg sweet spot is between 45mph to 60mph. Above 70mph and mpg drops way into the sub 14 mpg category towing also. Doors and top off kills mpg also.

I just reset one trip odo. to see what true mpg is now after 3400 miles
 

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Comment: It would be great if folks literally grabbed the list of items in the first post, pasted them in a post with your values and be done with it. The whole thing becomes much more browseable and fact-driven. To skim through this thread I am not able to get any real valuable data.

Request: You should also get their mileage. A truck with 1000 miles on the odometer is going to be different than one with 30000 miles. Maybe also request standard driving conditions eg. highway, city, offroad or combinations of the 3.
 
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jeepncrowd

jeepncrowd

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Comment: It would be great if folks literally grabbed the list of items in the first post, pasted them in a post with your values and be done with it. The whole thing becomes much more browseable and fact-driven. To skim through this thread I am not able to get any real valuable data.

Request: You should also get their mileage. A truck with 1000 miles on the odometer is going to be different than one with 30000 miles. Maybe also request standard driving conditions eg. highway, city, offroad or combinations of the 3.
Exactly! That was why the original post was set up that way. To be Copied and pasted, then edited.
 

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So far my Gladiator is getting significantly worse fuel mileage than my JLU. Kind of makes me paranoid to put my 35 back on it.

I saw 18 avg with 35s on the JLU. The JT is doing 17 stock. Ouch. I hope she breaks in and gets better than this.
How many miles do you have so far? I have heard as much as 1500 for the mileage increase to top out. (although I wouldn't consider 1mpg "significantly worse." - Are the axle ratios the same)?
 

steffen707

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Consider this a free bump, i'll post back my numbers in a week.


Jeep year & trim: 2020 Gladiator Sport S
Mileage: (XXXXX)
Engine: 3.6 pentastar

Fuel type: 87 octane
Lift: stock
Tire size and model: (37x12.5R17 Nitto Trail Grapplers)
Diff gearing: (3.73, 4.10, 4.88 etc)
Tuned?: (yes/no which ones)
Other add-ons: none
Tire PSI: ()
Speedometer recalibrated? (yes/no)
EVIC or hand calculated?:
Local driving conditions: ( Flat, hilly mountains, sea level, altitude, towing, highway, city)
Average MPG: ()
Anything else of interest. Plywood
 

ThomFoolery

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Jeep year & trim: 2020 Rubicon
Mileage: 5100
Engine: 3.6 pentastar

Fuel type: 87 octane
Lift: Mopar 2" Spacers
Tire size and model: 37x12.5R17 Toyo
Diff gearing: 4.10
Tuned?: No
Other add-ons: N/A
Tire PSI: ()
Speedometer recalibrated? Not Yet
EVIC or hand calculated?:
Local driving conditions: Fairly flat, lots of highway and city
Average MPG: 15.7 (if I drive respectably. Drops off quick if I'm in a hurry)
 

trez63

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How the HELL are you guys getting such great mileage ?
I have an LE with 35s and THE ABSOLUTE BEST I have gotten so far in mostly city driving is 13.6!!
What the hell is wrong with my truck? I am feathering the throttle and have almost never gone WOT.

13.6 is pathetic. Supposedly the dealer did a "Mopar Calibration" when they installed the new wheels and tires but man, I'm getting murdered over here.

I do almost all City driving with about 10 miles of highway driving in between. And it's mostly in traffic. But I would expect 15-17 for that. Not 13.5.

Is it possible the calibration is not done correctly? How can I make sure?
 

Jeepdude413

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I am currently getting 15.9 combined. Sport/ max tow, 35” tires. This include about 5 days of idle time at lunch for about 40 minutes and 20 miles a day of stop/ go traffic and 15 miles or so at 55 mph. On highway with cruise set, i am getting 20. Calibration completed with a rough country unit and verified by speed trap/mph sign along highway.
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