How do you JT gassers do it? MPG...

[sapientiam]

I went to pick up a new trailer on Monday, about 300 miles one way. On the way up there I got around 27.5 mpg, average about 70mph. On the way back I was at about 13mpg. I felt like I spent more time at the fuel station than on the interstate. Do the gasoline versions have bigger gas tanks? I swear it felt like by the time I merged back onto the interstate I was already 1/8 tank down.

I guess im spoiled with my average of 24mpg mixed driving with my Diesel. Godspeed out there my gasoline brothers, I'll see you at the next fuel stop.

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[Labswine]

I tow a 27', 5,100 lb (with all we want or need) with my Overland (ordered 5/19, delivered 7/19) and also get between 12 and 13 MPGs. I go around 200 miles then start looking for fuel.

I shift manually and never see 8th. I also don't go over 65 MPH. At that speed, I'm in 7th at around 2,100 RPMs. Any up grade reminds me it's only a V-6 so I simply drop a gear until I've crested the grade.

Not towing, the best I've seen (calculated fill to fill) was just north of 26.5 MPGs. I typically get around 21.5 running around (20.5 in the winter).

My rig...

 

[Jefe1018]

Here we go

Nice truck, believe it or not on 37’s I often see 16-17 towing pontoon at 60-70mph and I’m on 37’s with stock gears. Just can’t do it in the summer…. Which defeats the purpose of the pontoon right?

Yes, the 5 gallons we give up in the oil burners for a def tank is used for additional fuel in the 3.6 gas motor.

There are many pros and cons to the diesel platform. I don’t regret getting it, but I will be moving on to a gas powered truck here soon, likely not a JT. The reason? Towing in our extreme desert heat with a compromised cooling system just isn’t for me. I don’t want to mod the radiator, add a aux oil cooler, run a likely federally illegal tune, regear and probably still run into high oil temp issues.

 

[sapientiam]

Yes, the 5 gallons we give up in the oil burners for a def tank is used for additional fuel in the 3.6 gas motor.

I finally found a reason to do a DEF delete once my warranty is expired and switch to a bigger tank!

 

[intentsrig]

I recently picked up an Ovrlnd camper. On the trip to flagstaff, from Sacramento, I averaged a pretty terrible 15.9. 35’s and 5.13’s without the camper.

On the return I averaged 17.2 (entire trip) with the camper and 17.4 from Bakersfield to sac. Always about 65mph.

My theory is the jeeps windshield is so vertical it’s blowing the air over the camper like a fairing haha. With my softopper I was around 18mpg. So I think the empty bed caused a less aero more disturbed air flow? Who knows.

Long story short, I was pretty happy with 17 mpg with the gasser and a camper. It only weighs 290lbs so that helps.

This is all highway btw. The 5.13’s and 35’s are awesome. Holds 8th at 65mph in a headwind. Love it.

 

[Jrgunn5150]

I stop, fill the tank, and go about my business.

Somehow, I manage, to pull together the shattered pieces of my life and move on from such a traumatic event.

 

[Reddout99]

2021 Sport S. 2" Mopar Lift on 37s and am averaging 17 mpg.
Actually, better than the 12 mpg I was getting on my 2020 JKU, 2.5" lift on 35s

 

[WestwallNF104A]

I recently picked up an Ovrlnd camper. On the trip to flagstaff, from Sacramento, I averaged a pretty terrible 15.9. 35’s and 5.13’s without the camper.

On the return I averaged 17.2 (entire trip) with the camper and 17.4 from Bakersfield to sac. Always about 65mph.

My theory is the jeeps windshield is so vertical it’s blowing the air over the camper like a fairing haha. With my softopper I was around 18mpg. So I think the empty bed caused a less aero more disturbed air flow? Who knows.

Long story short, I was pretty happy with 17 mpg with the gasser and a camper. It only weighs 290lbs so that helps.

This is all highway btw. The 5.13’s and 35’s are awesome. Holds 8th at 65mph in a headwind. Love it.

It was blowing hard when I picked my OVRLND up so my mileage already was sucking. What I was happy about was the mileage didn't drop after the installation, even with the nasty head wind.

But my Rubi at 70ish, averages 17 with no wind. 14 with wind.

 

[chr15m]

My unsolicited $.02. Stock I could average 22 mpg on an all highway trip in my JTM. With 35s and a GFC on the back its between 18.5 and 20.5 depending on the time of year.

I think a delta of maybe 5mpg on average would take nearly 10 years to recoup the initial price delta for a diesel truck, for the average driver. Perhaps longer when considering routine maintenance cost deltas as well. As mentioned there are certainly pros and cons beyond mpg. Gassers get a higher capacity thanks to adequate cooling, as well as a larger tank. I tried to get a diesel but it never happened, prices were not as competitive around here and in the end with the 13k + price drop on my JTM it would have been more than a 4k difference between and JTRD and a JTM. Power is really the only thing that I wanted, but even then, gassers and diesels are both not fast.

 

[sharpsicle]

How we do it is we drive, and when we need gas we fill up. Just like anyone else.

The gas JT isn't a bad tow rig. Diesel-bros just seem to want to invent reasons to flex I guess.

 

[GWolgamott]

I still get 22-18mpg averaging around 20 despite mods that should have dropped it further down from the 24 I averages at stock with smaller tires. Pulling anything significant, and really don't tbh much, it gets about 17ish.

So if that is true about the extra fuel space for gasers, then that means I have somewhere between 100-80 miles extra in range at where I'm from at range about 15-20% cheaper a gallon, give or take. Which would be about right as I can get close to 400 miles or so range if doing highway driving. Give or take of course depending where driving etc.

 

[jwilson2899]

Oh look, another shit on someone else's Jeep post

The way I do it is to fill up when it tells me it needs more, and keep on driving getting my 18-19MPG. I'm really surprised you're seeing that low pulling a trailer. Based on the diesel bragging I'd figure it was closer to 20.

 

[Riverdog]

I used to struggle with jeeps and towing. For many years I'd swap my jeep for a big truck for a few months when I had to tow something -and then swap back to a jeep again. Eventually I just got a 2500HD for towing stuff , and my jeep is basically a toy. I'll throw a deer or a dirt bike in the back. The only thing I've towed with it is a 2500 lb wood chipper I rented. It did fine lol. I have no idea what my mpg are at the moment, haven't recalibrated the speedo for the 35's so the numbers are off.

 

[Jefe1018]

I used to struggle with jeeps and towing. For many years I'd swap my jeep for a big truck for a few months when I had to tow something -and then swap back to a jeep again. Eventually I just got a 2500HD for towing stuff , and my jeep is basically a toy. I'll throw a deer or a dirt bike in the back. The only thing I've towed with it is a 2500 lb wood chipper I rented. It did fine lol. I have no idea what my mpg are at the moment, haven't recalibrated the speedo for the 35's so the numbers are off.

That’s the boat I’d like to be in at some point. I figure if I can only have one, HD truck it’ll have to be.

I’d recommend you recalibrate sooner rather than later as it’ll throw off your shift points and could some wonky things to your abs sensors and throw traction control lights from what I’ve seen.

 

[Labswine]

I used to struggle with jeeps and towing. For many years I'd swap my jeep for a big truck for a few months when I had to tow something -and then swap back to a jeep again. Eventually I just got a 2500HD for towing stuff , and my jeep is basically a toy. I'll throw a deer or a dirt bike in the back. The only thing I've towed with it is a 2500 lb wood chipper I rented. It did fine lol. I have no idea what my mpg are at the moment, haven't recalibrated the speedo for the 35's so the numbers are off.

I'd agree with the re-calibrate ASAP. I had a '96 Ram 4x4 Xtra cab with the 5.2 in it. WHen I got it, it still had factory tires and I was getting around 18 MPG on the highway. I put slightly larger tires on it and didn't regear the speedo to compensate and teh best I ever saw was 12 MPGs. Yeah, the increase in tire geometry messed with the computer and the fuel curves and it couldn't properly compensate. No matter what I tried to fix the issue, it wouldn't correct the issue. I traded it on for my '96 Grand Cherokee. I put a small lift in, put larger tires on it, and RE-GEARED the speedo to compensate and had no issues in change in fuel economy.

The computers have pre-programmed fuel curves to deliver the precise amount of fuel for the gear and speed so, if the speedo is off, the program cannot properly compensate.

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