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Old 04-29-2015, 05:47 PM
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2015 JKU Fuel Tank Capacity

The spec book for my Jeep gives the fuel tank capacity as 22.5 gallons. I have filled up about 4 times since I got it and have yet put that much into it.
This last time, I intentionally drove it within 10 miles of empty (based on the last report from the dashboard at 30 miles left) - so maybe 1/2 gallon left.
The needle was slightly below the Empty line, and I still only added 19.74 gallons; accounting for the 1/2 gallon left, that is only about 20.25 gallons total.

Is there a 2+ gallon cushion built into the fuel system, or are my gauge and computer just that much off? How many gallons can you put in from empty?

In my previous non-Jeep vehicle, I could pump in the capacity limit and sometimes just a little more!

I guess I can carry a gas can and just drive it until I run completely out!

Thanks!!

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Old 04-29-2015, 05:55 PM   #2
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The only way to truly figure out how much gas you can put in the tank is to run it completely empty ( and even then there's probably a couple of quarts still sloshing around in there) Assuming you wouldn't want to run out of gas and strand yourself on the side of the road just in the interest of answering this question. Does it really matter? I mean, do you really think there's something wrong if it doesn't take you precisely 22.5 gallons to fill up?

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Old 04-29-2015, 05:55 PM   #3
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It is 22.5 gallons for the JKU. I have managed to get down low enough to get 22 gallons in it. The needle was below E. The DTE was reading 'too low'. And I was in the 'hood so I could have walked home and got a gas can. I was satisfied at that and no longer want to test.


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Old 04-29-2015, 07:56 PM
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Does it really matter? I mean, do you really think there's something wrong if it doesn't take you precisely 22.5 gallons to fill up?
I'm not saying anything is wrong. I'm moving from a vehicle with a 21 gallon tank that would truly hold 21+ gallons and at 22-24 mpg, I had a cruising range of close to 500 miles.

I was glad to see my JKU had a 22.5 gallon tank. I was anticipating a cruising range around 450 miles. (Versus my wife's Kia that barely gets 300 - which is annoying.)

I was just wondering if it was typical on Jeeps to reserve several gallons as a safety level.
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Old 04-29-2015, 07:59 PM
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Originally Posted by nwbronco View Post
I have managed to get down low enough to get 22 gallons in it. The needle was below E. The DTE was reading 'too low'.
Thanks Bob. That's interesting that the DTE reading gets to 'too low.' It looks like I'm going to have to test one more time. I gotta see that.

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Old 04-29-2015, 08:32 PM   #6
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I think it hits that read out when it cannot determine if the fuel available can get beyond the estimated MPG it is seeing.
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Old 04-29-2015, 08:48 PM   #7
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The book indicates the tank is "approximately" 18.5 and 22.5 gals. The reserve range is approx. 2-4 gals. Some JK's are closer to 4 others are around 2.
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Old 04-29-2015, 11:30 PM   #8
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Originally Posted by GTurbo View Post
I'm not saying anything is wrong. I'm moving from a vehicle with a 21 gallon tank that would truly hold 21+ gallons and at 22-24 mpg, I had a cruising range of close to 500 miles.

I was glad to see my JKU had a 22.5 gallon tank. I was anticipating a cruising range around 450 miles. (Versus my wife's Kia that barely gets 300 - which is annoying.)

I was just wondering if it was typical on Jeeps to reserve several gallons as a safety level.
I doubt your ever going to get a range of 450 miles even if you have stock 29" tires and have cruise control set at 30 MPH. The average range for a JKU seems to be around 300-320 miles with mods. I'm not sure how much "reserve" fuel is in the tank if any. The "Miles until Empty" indicator seems pretty accurate. It's not a bad idea to carry extra fuel for long trips.
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Old 04-30-2015, 02:05 AM   #9
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The OP is not strange in this post. I thought the wrong gauge sender was installed in my '12 JKUR and even the dealer replaced it under warranty. I've still never put more than 21 gallons in mine despite driving in some cases close to 100 miles after the light comes on.

It's one of the idiosyncrasies I've learned to live with and go more on the trip odo than the gas gauge- much like on a motorcycle.
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Old 04-30-2015, 02:55 AM   #10
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Lightbulb

The only times I have seen anything remotely close to the EPA 21 MPG on a JKU was on a tank that was all highway driving, at 65 MPH, with the front air dam on, on stock tires properly inflated, no lift, no spacers, no cargo, no hills, no side wind, no traffic congestion, on a Saturday, in the middle of May, in a leap year.

Under any other set of circumstances, you will be lucky to get more than 18 MPG.

To expect a 450-mile range based on an EPA of 21 MPG is like expecting a weekend after every Tuesday: it just ain't gonna happen.

Good luck,

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Old 04-30-2015, 09:53 PM
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To expect a 450-mile range based on an EPA of 21 MPG is like expecting a weekend after every Tuesday: it just ain't gonna happen.
Good luck,
Aldo
I'm averaging 19 MPG with my day-to-day driving. I recently got 19.7 MPG on a several hundred mile road trip.

I'm not quibbling over the MPG, just the tank capacity. My trip w/ 19.7 MPG would have had a cruising range of 443 miles - if I was able to utilize all 22.5 gallons.
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Old 05-01-2015, 06:27 AM   #12
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When my low gas light comes on I never get more that 17.7 gallons in my JKU.
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Old 03-05-2016, 07:21 PM   #13
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I like to do what I call the Kramer Test (based on the Seinfeld episode where Kramer test drives a car until it runs out of gas). I have driven it 20-30 miles after the message "low fuel" starts flashing on the dash. My jeep still only takes 19.9 some odd gallons.
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Old 03-05-2016, 09:35 PM   #14
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2015 JKU never put in more than 18 gallons, big reserve tank I guess...range is 300-320 miles always. Stock jeep with winch in front 3.73 gearing.
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Old 03-05-2016, 10:18 PM   #15
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When my low gas light comes on I never get more that 17.7 gallons in my JKU.
Mine is the same way. The gas gauge and low fuel indicator is configured very conservatively on these wranglers.
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Old 04-21-2016, 08:26 PM   #16
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2016 wrangler 4 door with 22.5 gallon tank. I have driven well past empty and managed to squeeze in 19.87 gallons. It is a bit frustrating as I would like to avoid gas stations as much as possible. If you figure an average 18MPG and you fill up at 18 gallons you average 324 miles per tank. I drive 20k miles per year ... which means I fill up 62 times per year. If I could use on average 21 gallons before filling up I would be averaging 378 miles per tank at 18 miles per gallon ... filling up only 52 times per year.
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Old 04-25-2016, 01:21 PM   #17
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Give it a test!

Quote:
Originally Posted by rskdsk View Post
2016 wrangler 4 door with 22.5 gallon tank. I have driven well past empty and managed to squeeze in 19.87 gallons. It is a bit frustrating as I would like to avoid gas stations as much as possible. If you figure an average 18MPG and you fill up at 18 gallons you average 324 miles per tank. I drive 20k miles per year ... which means I fill up 62 times per year. If I could use on average 21 gallons before filling up I would be averaging 378 miles per tank at 18 miles per gallon ... filling up only 52 times per year.
Then fill up a Jerry can with fuel, strap it in, fill up and go. See how far you can get down the road before you run out of gas. Jerry should give you five gallons so unless you live in TX you should have no issue finding a station within 80 miles. This will let you know under those conditions how far your Jeep can go on a tank of fuel. Now you will know your range.

As a side note I ran my TJ out of gas twice. Once at 303 miles and the second time (later that day) at 22 miles (I only put 1.5 gallons in due to not having my cc on me and only $5 cash). When I ran out for the second time I was across the street from the gas station I was headed to. Sad part is....I drove by another station 1/2 mile back but it was on the other side of the road and was "inconvenient". Yeah....great decision on that one.
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Old 03-22-2019, 11:45 PM   #18
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I kind of did the kramer test with my wife looking at the gauge lol that was amazing ( dont try this at home lol ). Drove from miami to coral springs on the turnpike at 80 mph +-
Had the gps telling me miles to get home until the computer told me low fuel on about 40 miles to get home

Kept running and running only did 30 miles more and filled 19 gallons.

Next try will be the boat behind 🤣😂

Need to fill those 22 gallons with the company card just need to do it!

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