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post #1 of 34 (permalink) Old 01-26-2016, 06:42 PM Thread Starter
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Question Fuel tank range question

Hey guys, so I'm trying to figure something out..

I'm new to these vehicles and i'm pretty confused on the fuel range.

Prior to me purchasing my Latitude, I had read online that they have a 15.8 gallon capacity and around 400 + miles (range) on a full tank.

When I took delivery, my vehicle showed a range of 280 miles with what was supposed to be a full tank. I figured they screwed up and didn't actually fill it. Well today was my first fill up and I noticed two things :

1. I didn't come close to the supposed 15.8 gallon capacity (filled up with 13.5, spilled gas at over 14)
2. The mileage shows 279 miles as the range.

Anyone else experience this ? Any ideas ? Could there be something wrong with my tank or computer ?

Fwiw, I've only driven in the city and have 284 miles on the clock.

Thoughts please.
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post #2 of 34 (permalink) Old 01-26-2016, 06:45 PM
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Umm, you get the range from multiplying the number of gallons available by the current average miles per gallon. You must be at about 18 MPG on the average readout?

The range will change depending on the average you currently are achieving.

Hope that makes sense....
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post #3 of 34 (permalink) Old 01-26-2016, 06:50 PM Thread Starter
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Thanks for the fast response. Actually, you are correct, I am averaging a little over 18 mpg with my city driving. So it calculates it based on your driving habits ? I was just curious since our other vehicles give you the full range regardless of average,etc.

Btw, does 18 mpg sound about right ? I've been babying it and haven't had a heavy foot with it since I'm still breaking it in.

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Originally Posted by SkipW View Post
Umm, you get the range from multiplying the number of gallons available by the current average miles per gallon. You must be at about 18 MPG on the average readout?

The range will change depending on the average you currently are achieving.

Hope that makes sense....
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post #4 of 34 (permalink) Old 01-26-2016, 06:59 PM
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Originally Posted by Txmusicman7 View Post
Thanks for the fast response. Actually, you are correct, I am averaging a little over 18 mpg with my city driving. So it calculates it based on your driving habits ? I was just curious since our other vehicles give you the full range regardless of average,etc.



Btw, does 18 mpg sound about right ? I've been babying it and haven't had a heavy foot with it since I'm still breaking it in.

Every car uses this calculation when showing range. If you are see the advertised range your driving habits are giving you high mpg.


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post #5 of 34 (permalink) Old 01-26-2016, 07:03 PM
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Hi there

First things first : try not to overfill the Cherokee, it doesn't like it... We've discussed this a few times on the forum and the general consensus is that on many modern cars, overfilling may damage the evap system. Wisdom says : stop at the first clic, put cap back on, don't insist.

18mpg city is possible with this Jeep. It all depends on how much stop-and-go you do, because *city driving* varies a lot depending on the city, the route you take, whether it is rush hour or not, etc... *Babying it* is very subjective as well. You'll have a better idea of mileage if/when you hit the open road. On the highway, there are usually less variables than in city/urban driving.

The range you see in the EVIC is adjusted by the computer as you drive. 400 miles is possible on the highway, depending on conditions, speed, load, winds, etc... but never in the city.

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post #6 of 34 (permalink) Old 01-26-2016, 07:22 PM
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Don't forget we're using winter blend fuel, it's generally going to cause a dip in fuel economy.

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post #7 of 34 (permalink) Old 01-26-2016, 07:27 PM Thread Starter
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Wow ! So many quick and good responses ! You guys rock ! Thanks guys !
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Last edited by Txmusicman7; 01-26-2016 at 08:37 PM.
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post #8 of 34 (permalink) Old 01-26-2016, 07:34 PM
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In the 3.2 AD1, I've gotten 400 miles on a tank (100% highway), when I drove down to the Outer Banks last summer. Good weather driving with city and highway mixed, I got around 300, and in the winter I'm finding that I get around 250.


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post #9 of 34 (permalink) Old 01-26-2016, 09:18 PM
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So, since everyone else has covered range, I'll take the tank size. To refil with 15.8, you would need to run the tank dry. When you hit the initial low warning, I think that leaves 10%, or almost 1.6 gallons. So, 15.8 is now down to 14.2, so 13.5-13.8 is pretty much the norm for a fillup. Dont top up past the auto shutoff, you could damage the emissions system.
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post #10 of 34 (permalink) Old 01-27-2016, 09:39 AM
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Quote:
Originally Posted by Txmusicman7 View Post
Hey guys, so I'm trying to figure something out..

I'm new to these vehicles and i'm pretty confused on the fuel range.

Prior to me purchasing my Latitude, I had read online that they have a 15.8 gallon capacity and around 400 + miles (range) on a full tank.

When I took delivery, my vehicle showed a range of 280 miles with what was supposed to be a full tank. I figured they screwed up and didn't actually fill it. Well today was my first fill up and I noticed two things :

1. I didn't come close to the supposed 15.8 gallon capacity (filled up with 13.5, spilled gas at over 14)
2. The mileage shows 279 miles as the range.

Anyone else experience this ? Any ideas ? Could there be something wrong with my tank or computer ?

Fwiw, I've only driven in the city and have 284 miles on the clock.

Thoughts please.

#1. As was mentioned by Bill837 you would have to drain your tank or over fill it to get the full capacity. There will always be residual gas in the tank AND you never want to run it near empty.
The fuel pump sits on the bottom and is cooled by the gas. Overheat it enough and you have a very expensive repair down the road, most likely out of warranty.
You can run out of gas and there will still be some in the tank.
Spilling over gas is very bad for your EVAP system. Stop at the first click off and save your self future problems.

#2. Range is basically real time based on how much gas is in the tank at any particular time and your currant mpg.
For instance When I go on the highway after driving say 100 miles in town at 19 mpg my range may say only 270 miles. Once on the highway at 32 mpg my range starts to increase. It works the same in reverse.
In fact average mpg works the same way but can be reset by resetting the trip(s) to 0.
I usually run 30-33 mpg on the highway depending on the time of year(winter) and avoiding urban gas. Both mpg killers.
I have a V6 with AD2 and Tow.
The trail hawk is heavier and thus that impacts mpg also.
Not sure what the conversion formula is for added weight/mpg though for the Cherokee.

Also being a new vehicle impacts mpg big time especially with this ZF 9 speed. Mine had around 2,500-3,000 miles before it even started using 8th gear.
Once it started using 8th easily, my mpg shot up by 3/4 mpg I would guess.
You have to give your Cherokee a few thousand miles at least to fully break in for mpg.

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