JT owners post your MPG

[BAT]

It gets better - normally, anyway. No miracles, but many times you gain some mpg with time and miles. The computer learns, things wear in and loosen up.
Each new vehicle I've had over the years always seemed to get better somewhere between 7,000 and 10,000 miles. My AMCs it was usually about 10,000 miles, then they'd seem to do better power-wise and mpg-wise. My trucks have been similar - although my Ford seemed to get worse with age.
My Overland got Rubicon take-offs last winter and the rolling size was so very close the speedometer/odometer was really still almost spot-on according to radar and my Garmin stand-alone GPS. The measured height of the truck with the tires swapped was still pretty much the same. But with a Sport that will likely be different - and looks like you found it was.

I figured with the Tazer I could put in the tire size myself to be a bit more accurate. I also forgot I need to take into account the Idrive unit I put in could be a factor. I've had it set on the Ultimate 4 setting and this thing is way more responsive in regards to the throttle than before. I just barely press on the throttle and it goes. I guess I could play around with the Eco modes and see if that changes my mileage. Usually I do a lot of highway miles but with the virus and working from home all the time I am not seeing much highway miles right now just stop and go city miles

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[ShadowsPapa]

I figured with the Tazer I could put in the tire size myself to be a bit more accurate. I also forgot I need to take into account the Idrive unit I put in could be a factor. I've had it set on the Ultimate 4 setting and this thing is way more responsive in regards to the throttle than before. I just barely press on the throttle and it goes. I guess I could play around with the Eco modes and see if that changes my mileage. Usually I do a lot of highway miles but with the virus and working from home all the time I am not seeing much highway miles right now just stop and go city miles

I need to learn more about those units. The accessory guy at a local dealer even talked about something for about $140 that would let me fine-tune tire sizes and do other fun stuff.
I need to seriously look into those tools.
Way more responsive? Heck, I thought mine took off like a striped-butt ape when I hit the gas - you mean it can do better?

 

[ShadowsPapa]

I just picked mine up and it is steady 16 mpg on 35 inch tires with stock suspension. I know as things get worn in mileage is going to get better hopefully. Right now, I am not super happy about fuel consumption, its worse than my previous lifted JKU with manual.

16 isn't great, but then I don't know what the landscape is like in NJ - and please don't take offense - I don't know your driving habits or methods, so hard to say much else, but yeah, you should see better. Other JTR owners with 35s are beating that - so I would think you could or should.

 

[BAT]

I need to learn more about those units. The accessory guy at a local dealer even talked about something for about $140 that would let me fine-tune tire sizes and do other fun stuff.
I need to seriously look into those tools.
Way more responsive? Heck, I thought mine took off like a striped-butt ape when I hit the gas - you mean it can do better?

Well there are a number of different units out there and I did a good bit of research on them while waiting to buy the truck and then once I know I was getting the truck I ordered them and had them in the garage when the truck came. I went with the Tazer Lite but they also have a Tazer Mini which does a lot more but the Lite did all I needed. As for the Throttle control I went with the Idrive but there are others. I haven't even tried the Ultimate 9 Beast Mode yet. I think I need to try that setting to see what happens. Could be its just me but I find now with the Idrive the throttle is way more peppy and smooth than without. I am still learning what all the settings of it can do since you kind of have to be out on the road driving to change the modes and see what happens.

 

[Murgatroid]

I've had mine for a year and the average MPG for the year, after 16k, is 22.1 for a stock Sport S with 4.1 rear end.

 

[ShadowsPapa]

Well there are a number of different units out there and I did a good bit of research on them while waiting to buy the truck and then once I know I was getting the truck I ordered them and had them in the garage when the truck came. I went with the Tazer Lite but they also have a Tazer Mini which does a lot more but the Lite did all I needed. As for the Throttle control I went with the Idrive but there are others. I haven't even tried the Ultimate 9 Beast Mode yet. I think I need to try that setting to see what happens. Could be its just me but I find now with the Idrive the throttle is way more peppy and smooth than without. I am still learning what all the settings of it can do since you kind of have to be out on the road driving to change the modes and see what happens.

Thanks. I definitely need to look into those - I wonder if the dealer accessory guy was talking about a device like the Tazer - he said I could tune the speedometer for different tire sizes and mentioned some other stuff.
As for "throttle" I am very concerned about one thing -
I took my 1500 pound car hauler (an all aluminum tilt bed flat bed trailer that sits low and actually pulls pretty easy - didn't even feel it behind my 1/2 ton Chevy)
I took it to Omaha last winter - I80 in western Iowa. Not flat flat, but not crazy hills either.
The JT struggled badly. It got a whopping 11 mpg when normally I can do over 20 - 19 if I go 70+
It had trouble on hills, no power, transmission constantly hunted to make even what I call easy hills. I think it was gutless. And that was EMPTY trailer, no wind resistance.

This is my rig - empty going TO Omaha from Des Moines, then my load - 4 Rubicon take-off tires and wheels in the back (about 320 pounds) and some flat, light, plastic dealer signs on the trailer.
And that truck struggled - 11 mpg - trouble on hills.
So I wonder if one of those performance tweaks could help...........

 

[BAT]

Thanks. I definitely need to look into those - I wonder if the dealer accessory guy was talking about a device like the Tazer - he said I could tune the speedometer for different tire sizes and mentioned some other stuff.
As for "throttle" I am very concerned about one thing -
I took my 1500 pound car hauler (an all aluminum tilt bed flat bed trailer that sits low and actually pulls pretty easy - didn't even feel it behind my 1/2 ton Chevy)
I took it to Omaha last winter - I80 in western Iowa. Not flat flat, but not crazy hills either.
The JT struggled badly. It got a whopping 11 mpg when normally I can do over 20 - 19 if I go 70+
It had trouble on hills, no power, transmission constantly hunted to make even what I call easy hills. I think it was gutless. And that was EMPTY trailer, no wind resistance.

This is my rig - empty going TO Omaha from Des Moines, then my load - 4 Rubicon take-off tires and wheels in the back (about 320 pounds) and some flat, light, plastic dealer signs on the trailer.
And that truck struggled - 11 mpg - trouble on hills.
So I wonder if one of those performance tweaks could help...........

Could be perhaps read up on them a bit. I know the I drive has 9 Eco Modes and A/C Mode which kind of selects for you and then 9 Ultimate modes. As for the Tazer it allows you to a lot of things. I set my tire size, turned off the auto start/stop. Set hood alarm. Does quite a bit more and I am still figuring out things but many I would not have any use for unless I was rock climbing. They all can be done sitting at the steering wheel. If you have to bring it to the dealership you just set it back to factory and unmarry the unit. Then when you get it back set things backup again.

 

[ShadowsPapa]

Could be perhaps read up on them a bit. I know the I drive has 9 Eco Modes and A/C Mode which kind of selects for you and then 9 Ultimate modes. As for the Tazer it allows you to a lot of things. I set my tire size, turned off the auto start/stop. Set hood alarm. Does quite a bit more and I am still figuring out things but many I would not have any use for unless I was rock climbing. They all can be done sitting at the steering wheel. If you have to bring it to the dealership you just set it back to factory and unmarry the unit. Then when you get it back set things backup again.

Thanks - I'll do some research! (now I have some more info and know people have used these on the JT with success)

 

[BAT]

So after 1000 miles on my truck with mostly all city driving (Stop/Start at lights, etc) I am averaging 16 MPG now with the Rubicon Take off tires. I just took off the hard top and put on the soft top so not sure if that is going to effect the mileage any. Been checking it manually verses the onboard mpg reading and it has been pretty spot on. Will keep checking it to see if it improves (hope it doesn't get worse). Been using different Idrive settings but that hasn't seemed to effect the MPG much from what I can tell by changing the modes.

 

[ShadowsPapa]

Took a drive in the JT to Spirit Lake today. Filled up part way up there and drove about half the miles you see in the pic below with cruise at 69 and half set at 59 (different speed limits - about 4 over most of the trip)
Same tank of gas, got home and it's settled to about 24.2 after driving back going south on I35 at 75 mph with a SE wind coming at us.

 

[Blade1668]

Well I normally get around 23.3 to 23.6 MPG unless I drive around in Decatur and

Huntsville, AL. then it drops to 22 something or hwy 157.
Another thing is the odometer on mine reads a mile faster than actual speed when I'm doing 70 by it the actual speed is 69 MPG checked by GPS. That running tires at 40 psi. Ido note the MPG drops if I'm driving around 40 mph and over 68 mph. Shift points on it effects lower speed. Stock AT tires and rims, Max-Tow. If I only drove around at 55 mph I might push it to 24 or 25 mpg doubt it. Gearing and tire size does make a difference, in my XJ I have got 20+ mpg with corrected speedometer. I have kept a log of all my gas purchased for my Jeeps. Since I have had them. I started doing it in 1991 partly to compare gas prices and what I got for mileage depending on where I got fuel. I always lost MPG when I got gas in IL. (4-8 MPG probably due to much alcohol in gas) I would get better MPG with gas from KY, IN, and GA. in past. Since I haven't filled up the JT in other states (just AL.) I can't compare currently. My XJ lifted, lockers, 4:56 gears, skid plates and 33 MTs got better MPG than my LJ.

 

[ShadowsPapa]

The 23.xx range is pretty typical now when I include very much interstate driving at 75 but then as has been discussed to death, speeds over 65 will drop the MPG on pretty much anything. Even my Silverado mpg tanked at speeds over 60-65.
Gear is huge, shift points, keeping the engine in that sweet spot and with the JT - any wind has a huge impact. We saw that as we drove the same route up and back and noticed a change just based on wind direction when in upper Iowa because the land is very flat there so we couldn't count hills as having an impact. My wife even noted the wind direction change -she said "it's going to drop now, let's watch" and sure enough - she nailed exactly what happened.

 

[brianinca]

At over 4K miles and an oil change, pretty happy with highwy MPG. Tazer corrected 35" KO2's on a JTR auto, on the run down from Redway to Arcata to Ukiah we got 17.8 MPG, consistent with every other fuel stop along the way. The computer reports .4-.9 MPG more than the calculated mileage, NEVER less. For hilly highways at up to 75 MPH on cruise, I can definitely live with that. Interesting the computer puts range at around 380 miles.

 

[BAT]

Today I made a run to Galveston and was getting about 20 MPG going down. I dropped my top going back to Houston and it was pretty windy. The fuel mileage dropped off as the bun was creating some drag so I pulled off the interstate and put the top back on and then the MPG went back into the 20 MPG range. I only drove 70 most of the way.

 

[ShadowsPapa]

Today I made a run to Galveston and was getting about 20 MPG going down. I dropped my top going back to Houston and it was pretty windy. The fuel mileage dropped off as the bun was creating some drag so I pulled off the interstate and put the top back on and then the MPG went back into the 20 MPG range. I only drove 70 most of the way.

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.

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