Mojave MPG Concerning

[AmishMike]

Drive it and get in sync with it. It is amazing how at the same speed, same terrain, etc. that just a touch of the pedal will make a 5mpg difference without seemingly accelerating or coasting.
That stupid little gauge can be mesmerizing and helpful to learn the truck.
With my JTR I can average 18.5 in mixed driving after 2,500 miles.
My wife's 2014 Outback will get well over 30 mpg......over 80mph but at 75 it gets 30.
My 1990 F250 extended cab, with a 460 and a/t, sidesteps, mudguards, stupid visor etc. was good for 14 around town and 16+ on the highway empty or with a loaded 28' enclosed trailer.

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[ShadowsPapa]

I know they claim there is no engine break in period, but I noticed a significant change around 3500 miles. I am usually in the mid 16s on my LE.

Mine jumped appreciably at about 6500-7000 miles. I was happy with 20-22 and now I have to try hard to get as low as 20. 22-24 is normal and I've done better at times.
It's always windy here and we have a lot of hills so I never expected anything over 18-19 but it exceeds that easily.
The engine is technically broken in after only hundreds - BUT it's not "break-in" that matters so much as the total wearing in and the learning of the systems the thing has.
These are not your grandfather's engines.
Break-in happens fast and people misuse and abuse that term wildly. It's a simple process, not what people think.
But the total wearing in takes longer - plus, the systems learn as well. You also have other components that will "loosen up" with time.

 

[Shankapotimus]

I’m averaging 17.9 after 5000 miles. Went on long road trip from california to Montana and averaged just over 19 mpg

 

[Logan94605]

I had the same concern a few weeks back. In the first few weeks, I couldn't get past 13.5 mpg but at that time I hadn't really taken it on a road trip. My home is in an urban environment with lots of steep hills so it's down to the freeway... Heavy accelerating to get on then 70+ for three exits and off again. It wasn't until I did a couple weekend rides out into the foothills and to the beach that I started to see 19+ mpg. Today I'm just around 1500 miles and seeing 16 -17mpg around town with a few dips. I'm sure if I lived in the flatlands and could drive at or below the speed limit, I would see those window sticker numbers.

 

[betsy]

I live in Maine, up and down hills all the time. When I started driving my JTR I was a bit concerned, but it was in November so through the winter month’s I was getting 16-18 mpg, when good weather hit, mpg went up. I left my job at the end of March , that was when I started getting 19-24 mpg ,and continues to get decent mileage, also drives better (acceleration is smoother) I suppose I have gotten used to the 8 spd. Now has 22k miles. I do believe that you have to give it some break in for better mpg and performance. I also noticed that the Rubicon with 4.10 gears is better on the secondary roads than the highway driving for mpg .

 

[Freebooter]

Our Mojave has 2000 miles. Average is 19.8. I drive like an old man because I am one!

 

[spence]

Got 1k on mine now. Getting around 15.2 as an average. I traded a GTR for it. I find myself driving it like it is a GTR, would assume if I eased back a little it would do better.

 

[KurtP]

Im getting 18 on 87 octane, 19-19.2 on 93. I use the cruise a Lot.

the mpg killer on the rubicon and mojave is the mt tires. Swap on a 31-32” passenger car/suv tire and a bed cover and youd sky rocket.

 

[ShadowsPapa]

What size and type of tires ? What Pressure ? Are they standard highway truck type ?

Here we go, denial. I've achieved those numbers before. I can easily do 22-23 and have had a tank that averaged 24. I don't understand why some refuse to believe that some of us actually DO get those numbers.
And earlier this week I PROVED my odometer and speedometer to be 100% accurate with GPS and phone. So no, it's not a mistake or the Jeep speedo lying to me.
I keep my tires at the spec psi.
Driving habits, and the ESS are a big help of course, more than a lot of other stuff.

 

[ShadowsPapa]

Im getting 18 on 87 octane, 19-19.2 on 93. I use the cruise a Lot.

the mog killer on the rubicon and mojave is the mt tires. Swap on a 31-32” passenger car/suv tire and a bed cover and youd sky rocket.

Cruise on these helps. Odd but seemingly true. My wife gets 25-27 with her GCs.
MT tires are indeed killers - radical tread hurts mpg.

I'm curious about your mpg differences with octane changes.
I used to have a spreadsheet I got from the Chevy dealer that tracked whether you were better off economically buying E85 (it was a FLEX FUEL truck) or other gas based on prices. It accounted for the mpg drop with E85 and so on. At certain points you were better off with cheaper E85, other times based on gas prices, regular gas.
My Silverado, however, also benefited with more HP and far far better towing ability on E85 so I tried to use it as much as possible. Of course the very high octane was a help power-wise.
But here there's a HUGE difference in 87 10% compared to 91 or 93 octane straight. Iowa has a big tax advantage for ethanol fuels.

 

[MrZappo]

Here we go, denial. I've achieved those numbers before. I can easily do 22-23 and have had a tank that averaged 24. I don't understand why some refuse to believe that some of us actually DO get those numbers.
And earlier this week I PROVED my odometer and speedometer to be 100% accurate with GPS and phone. So no, it's not a mistake or the Jeep speedo lying to me.
I keep my tires at the spec psi.
Driving habits, and the ESS are a big help of course, more than a lot of other stuff.

No denial. Questions.

 

[Dewyaw]

No denial. Questions.

He doesn’t have a Mojave...

 

[KurtP]

other than driving habits, it's the tires. Keep your speeds reasonable and your foot light. Dont expect big MPG on MT's.

 

[KurtP]

Cruise on these helps. Odd but seemingly true. My wife gets 25-27 with her GCs.
MT tires are indeed killers - radical tread hurts mpg.

I'm curious about your mpg differences with octane changes.
I used to have a spreadsheet I got from the Chevy dealer that tracked whether you were better off economically buying E85 (it was a FLEX FUEL truck) or other gas based on prices. It accounted for the mpg drop with E85 and so on. At certain points you were better off with cheaper E85, other times based on gas prices, regular gas.
My Silverado, however, also benefited with more HP and far far better towing ability on E85 so I tried to use it as much as possible. Of course the very high octane was a help power-wise.
But here there's a HUGE difference in 87 10% compared to 91 or 93 octane straight. Iowa has a big tax advantage for ethanol fuels.

the ECU is going to spray less fuel and advance timing more with 93 over 87. Higher power at lower throttle input, so less fuel consumption.

 

[Tufelhundin]

Speaking of driving style Im guessing that using the cruise control is not a good thing "for mine". When it had stock suspension and stock tires my sport S "3.73's" would get maybe 17mpg at 65mph with cruise on and worse at 70mph. I seem to get better around and in town. Id much rather stay off of interstates where speed limits are higher. Actually leaving here in an hour and heading on a 2200 mile round trip...I shouldn't have to worry about peeing with all the fuel stops, LOL.

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