MPG Experiment

[Blade1668]

My dealership had to rebuild my rear differential. It’s been nearly 1000 miles of me breaking it in and my gas mileage is finally starting to come back to what I would consider to be normal.

Well I'd tried to have them drop in a locker since they had it torn down.
Second part I loved the MPG'S with stock brand n size Desert Dueler tires, but I was getting sick n tired of plugging n patching them. F@@@@@@ road refuse around Huntsville.
I've killed a lot of MPG's due to crap loaded in n on my JT Max-Tow. With out all the stuff and keep speed down 69 MPH or even better 55-59 MPH I'd pull in 23 plus MPG'S. (Stock tires AT's or HT's) but the odometer was reading 1 mile faster than actual speed. With the current tires odometer is on. A factor that could be a very slight help is when it's sunny out too. The solar power adding energy to not need the parasite drag of alternator???? (If parked the sunlight the starting battery rides at about 13.3 or so volts.)

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[Blade1668]

I forgot to add I got best ride/ handling and MPG's around 40 psi air pressure. Hand calculated mileage only trip meters not quite as accurate.
Adding the RTT cost me 3 MPG'S I'm sure.

 

[Gren71]

I forgot to add I got best ride/ handling and MPG's around 40 psi air pressure. Hand calculated mileage only trip meters not quite as accurate.
Adding the RTT cost me 3 MPG'S I'm sure.

nice!

Yea, im sitting at 34psi at the moment on my Duelers. Only really because the fill station is broken at my local gas station and ive been too lazy to do it my self. The weather has been wild and windy so I havnt been adding the date but i can certainly notice a little worse MPG with the lower PSI. I prefer to be 36-37 cold and notice the most middle ground between good MPG and not being a wind kite when im at 36/37. Iv im at 40 cold i feel like I wonder too easily on the road.

 

[Stan H]

Well, I had the factory size for 3 years with stick bumper with air dams .. average 17-18mpg . No matter what I did empty uphill down hill curves slopes ,mud ,pavement ,gravel, dirt. I live in a very hilly state with many 2 lane and single lane roads . So I aint worrying about MPG anymore done did that now its just for function going big and not looking back period to H with MPG.

 

[Jeeper44mag]

Based on your finding I'm thinking about adding the air dams, I have a sport s max tow, and am stock stock stock, and struggle to maintain 18mpg driving like a granny. Getting an extra mile per gallon would save me roughly $200 per year.
Any Rubicon owners (with 4.10 axels) want to share their mpg? I'm wondering if bigger wheels actually helps mpg... <totally not me justifying buying bigger tires ?
And if I'm stuck at 18mpg thats okay, I get a ton of smiles per mile with this truck!

Stock 2020 JTR 3.6L w/Automatic & ~31,000 miles running cheap 87 octane gas. Disclaimer... all driving is done with a very well educated right foot watching the mpg indicator and using cruise whenever on flat ground. I don't exceed 60 mph ever, and most driving is ~60% highway/back-roads, 40% city.

 

[Jeeper44mag]

What a great write up!!

Im now seeing that the locking diffs on the rubicon are really a key to Low MPGS?

Im new to the jeep thing and new it would be the best, im just upset that its the same mpgs if not a little less then my V8 5.7L 2020 2" lifted ram with 34" tires. that was getting 15.5-16 mpgs. And all i can seem to get out of this rubicon is in the 13.8-14.5 range bone stock. (same commute mostly highway 70-75mph)

That makes me fear to put 35" and a mopar 2" lift on the Rubicon.

So is it just me or is this typical for the rubicon MPGS?

Thank in advance.....any info is appreciated . also would you do a 2" mopar with 35" tires? mostly daily drivin highway and prob will be in a truly off road trails ride 6-8 times a year.

Where do you drive? I average at LEAST 21-23 mpg with my stock 2020 JTR (3.6L gas w/auto trans)

 

[Trippin01]

you put a ton of work into that research. nice. I have to ask, is it worth it to have a 2 wheel drive jeep truck just to get 20-25 mpg?

I get more smiles per gallon with a 6.5" lift, 38x13.5 tires with 5.13 gears. I even giggle a bit when I hit eighth gear doing 70mph driving to Moab. I'm getting 14.5 mpg's since I went to the Milestar tires (up from 13 mpg's on the 37x12.5 Yokohama's) but I'll never give up my 4 wheel drive for a 2 wheel drive imposter. I have a car for great mpg's.

 

[KWin]

Stock 2020 JTR 3.6L w/Automatic & ~31,000 miles running cheap 87 octane gas. Disclaimer... all driving is done with a very well educated right foot watching the mpg indicator and using cruise whenever on flat ground. I don't exceed 60 mph ever, and most driving is ~60% highway/back-roads, 40% city.

yea that makes sense, not going above 60 brings my mpg waaaay up, but I can't bring myself to do that lol.

thanks for the info!

 

[TheRealStreetcommander]

2023 JT Willys 3.6ZF, all factory, ~15K miles. Factory BFG MT KM3's @ 42PSI, Hardtop.

Just completed 1000 mile trip through mountains of VA and NC. Two people, light luggage. 87 octane.
50% 70MPH using CC.
50% 80MPH using CC.

IC indicated 19.7mpg. Hand calc'ed to 19.5mpg

The Pentastar and ZF8 are extremely efficient for being wrapped in a brick. I'm not convinced that a Hemi, LS, or any other gas engine would do better --probably be worse. A Cummins would be magic. Cummins make everything magical.

 

[Jeeper44mag]

you put a ton of work into that research. nice. I have to ask, is it worth it to have a 2 wheel drive jeep truck just to get 20-25 mpg?

I get more smiles per gallon with a 6.5" lift, 38x13.5 tires with 5.13 gears. I even giggle a bit when I hit eighth gear doing 70mph driving to Moab. I'm getting 14.5 mpg's since I went to the Milestar tires (up from 13 mpg's on the 37x12.5 Yokohama's) but I'll never give up my 4 wheel drive for a 2 wheel drive imposter. I have a car for great mpg's.

Different strokes for different folks dude. I'm 100% sure that none of us here own a "2 wheel drive imposter" and don't even attempt to tell us that you never take yours out of 4wd.

Sounds like you have a pretty nice rig, but maybe you should have bought a diesel? Not all of us need 6.5" of lift or 38" tires to put a smile on our faces, but I think most of us here in this thread are smart enough to know that if we intended to go that route, the diesel would have been a better choice.

 

[sharpsicle]

Sounds like you have a pretty nice rig, but maybe you should have bought a diesel? Not all of us need 6.5" of lift or 38" tires to put a smile on our faces, but I think most of us here in this thread are smart enough to know that if we intended to go that route, the diesel would have been a better choice.

I mean at a certain point, just get a Peterbilt if you want that feeling of climbing up into a "rig". ?

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