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Gas Guage to empty

27K views 26 replies 19 participants last post by  Mark_  
#1 ·
New owner so kind of a dumb question, but I think a useful one for other new owners.

What is the Empty tank grace period? For reference, my gas guage just hit the red section and showed about 30 miles left on the range. Now the range reads LOW but I'm curious just how much is really left in there?

On my subaru I could run the range down to about 10 or 20 and it was then replace the number with a dotted line, meaning fill up quick. I found when filling up at that point I still had about a full gallon of grace fuel.

Anyone care to chime in? I don't plan on running out of fuel but I would like to have an idea of what the leftover amount is. I guess another good way is to fill it up and take the difference from 15.8?
 
#2 ·
You'll most likely get very varied responses due to different MPG experienced by many. In my case i'd be on the bottom of things since most my driving is up and down and around the mountains. I'm only getting 19-22 mpg max (varies) due to my driving type/style and location. I've never ran it down, but sure many have. due to my location we never head up the mountain to home without topping off. I'd be interested in hearing from others as well, but I simply can never let it get that low.
 
#4 ·
I'm too lazy to go dig through the manual, but I seem to remember it actually listing the capacity, and it being a bit over a gallon. 1.6 if memory serves, but dont quote me on that.
 
#6 ·
....Anyone care to chime in? I don't plan on running out of fuel but I would like to have an idea of what the leftover amount is.
Problem is it may not be the same from KL to KL.

Only way to know for sure about yours is carry can with extra gas. Drive and stay on level road. When gauge touches the lowest point, count the miles until the engine starts missing.
 
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#7 ·
Mine was a few pixels from the end of the red bar, we'll to the left of the middle of the red section. I decided not to chance it on my first tank and filled up. I got a little over 14 gallons so that means at the end of the bar there should be a solid gallon in there. Depending on current driving that can be very helpful information.

I would have looked at the manual but they lost mine at the dealership so they ordered one in for me. That's why I keep asking novice questions.
 
#17 ·
You can get the manual online at jeep.com. It's the most updated version and it's searchable. Plus the paper manual that you get is not as extensive as the online pdf version.


I carry a copy on my smart phone.


It used to be that you didn't have to enter your VIN in order to get it, but I think that now you have to. No need to wait for your dealer. download the manual today and you can look up your novice questions (which by the way, most of us here don't mind seeing).


P.S. it's spelled, "gauge," not "guage." :)
 
#12 ·
Any Audi I've driven does not behave like the Cherokee... I had to get used to it... I kept saying to it - "it's when the range is Low that I need you to be most accurate". Audis went down to 5 then 0 (then you got a little bit further if you needed it). The Jeep stops giving me numbers at anywhere from 50 to 35 I think. When it goes to Range Low I go to fill up these days as I don't trust it and, yes, I've been caught-out (thankfully at home, in the driveway, but still... not good of me and not good for the car I'd presume).

It's seeming randomness, up and down like a yo-yo, is also disconcerting. I've been parked front-in in a parking bay and started the car with 90 miles of range, as I've reversed out and moved to D to set off, it's dropped to 62 miles. That was a very expensive and long reverse out it seems. :smile:
 
#11 ·
Is the "crap" in the bottom of the tank really a major issue though these days? I would imagine if you go to brand-named gas stations you shouldn't have to worry about any excess gunk in your gas tank. I could see an issue if you kept filling up at Joe Blow's Gas Station where the fuel might not be as clean or "top-tier," but in general, is that honestly an issue?

I only ask because I wonder if this is one of those urban legends from back in the day that simply stuck around like some people still clinging onto the idea that you should wait a couple minutes on cold days before setting off, which was certainly the case during carburetor days, but not now.
 
#10 ·
Actually about 1 gallon in reserve at that point. There is also some unusable gas always in the tank sump.
The big issue is not how much gas is remaining to drive on, but how much gas is left to cool your fuel pump.
A hard working fuel pump can overheat if not cooled properly. The surrounding gas will keep it cool. The more the cooler it will stay.
Fuel pumps are very durable but are susceptible to degradation over time by overheating continually. The cooler they run over the years the longer they will last.
They are very expensive to replace.
I believe there is a primary filter in the tank to protect the pump's impeller from ingesting any debris that accidentally gets introduced into the tank.
Usually not an issue as the tank will stay clean if you are careful while fueling.
Filling at 1/4 remaining is good practice. If the light comes on you waited to long and are likely hurting the life of your pump.
Just my humble opinion.
 
#13 ·
The range is also going to vary depending on the current MPG that the EVIC is stating. If you have a gallon left, and your current MPG is 26, the range will be based from that. If your MPG is less, the range left will be based off of that reading...

Freeway driving and regular driving ranges are going to vary widely. So, to keep from worrying about the range left, I never go below a 1/4 tank :). I did drive once until the "Low Fuel" light came on, just to make sure it was working...
 
#15 ·
I've tested this out when I got the Cherokee so I knew what the limit was; I got right around 50 km / 31 mi before I was completely out of fuel.

I was doing city driving from the time the low light came out till I ran out.
 
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#16 ·
You will probably has no more than 20 miles of range left when you get that warning. I probably varies slightly from vehicle ot vehicle, engine size to engine size. If you are on a highway when that hits, start looking for a gas station quick!!
 
#19 ·
You would not believe what in the bottom of even the TOP TIER fuel tanks, Remember the same tanker that delivers Gasoline in one run could deliver Diesel the next. I have spent the last thirty five years taking care of fleet vehicles from all over So-Cal and the Central Valley, a lot of "Stuff" gets into those underground tanks and from the suppliers too. It is not a "Legend" as what you can find in the bottom your tank, pull one, some day and find out ,I have several times...
 
#23 ·
Over 10 years the tanks at my Yard were pulled three times for various reasons, Leak alert, new Calif Laws, etc. We got fuel, both kinds straight from the refinery's here in Low-Cal. We still found JUNK in the bottom of multiwalled fiberglass tanks..The newest tanks are above ground.....
 
#27 ·
Yeah I realized early the range calculation is not reliable, because of how it works most likely. But as far as the low fuel light and warning, they're as accurate as I've seen. I usually wait for the fuel light, and put in consistant amounts of gas from fill-up to fill-up. I haven't made it to completely empty, always have a gallon or more left.