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'11-Up General Questions General questions related to 2011-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 01-25-2013, 08:25 PM   #1 (permalink)
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How accurate is the fuel gauge?

I've only had the truck a few days, and stopped to fill the tank when the display said I only had 45 miles of fuel left. I topped it off as much as I could without spilling, and it only took 20.3 gallons on a 26 gallon tank.
I apparently have a lot of fuel left when the truck thinks I'm out.
Can you safely drive beyond the "0" miles left?
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Old 01-25-2013, 08:46 PM   #2 (permalink)
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Every vehicle I've owned has been able to be driven well past 0 mtg on the computer. Haven't tested it with the new truck (and don't plan on pushing it either). That said, most fuel tanks hold a non usable amount of fuel too.

Assuming 15 miles per gallon average, your 45 mile to go would eat 3 of your six gal. Conservatively figure a gallon or 2 non usable, your computer probably wasn't horribly off.
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Old 01-25-2013, 10:31 PM   #3 (permalink)
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Thanks!
According to the fuel mileage gauge, I've been averaging 17.5mpg since I picked the truck up Saturday, and don't know how full the dealership filled the tank. I know I topped it off today, and will see how this tank goes. I'm used to having two tanks, so you can be a lot more brave when you've got another tank of fuel at your fingertips. ☺
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Old 01-25-2013, 11:59 PM   #4 (permalink)
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Put a 5 gallon jug in the back and run it out o see.
If you do run out. Pour in your fuel and then Key On/ Key off 7-10 times to prime the fuel system. Don't even crank, Just KO/KO. Similar to the process that you do after changing fuel filters when you need to fill the new filters .

I've run out once and it took 37 gallons in my long bed. And my distance to empty had been just barely past 0 miles to go. So it was pretty accurate on mine.

Another thing you can look at is, Set your Trip A each time you fill up, It will display the gallons used since reset. I find this is very accurate, Usually with in 1/2 gallon of what I can put into the tank when I fill up. So regardless of what your miles to empty show, You can see how many gallons you used and know if you are getting to the bottom
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Old 01-26-2013, 07:01 AM   #5 (permalink)
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Great idea, thanks!
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Old 01-26-2013, 08:32 AM   #6 (permalink)
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i prefer to fill up at a quarter or more. i ran my '02 out one time, a couple months later was replacing injectors. don't know if it was coincidence but not worth the risk again.
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Old 01-26-2013, 09:38 AM   #7 (permalink)
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Taking into account that I fill up when at the halfway mark, (just in case of substandard fuel), my guage has been on the money.
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Old 01-26-2013, 12:28 PM   #8 (permalink)
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Keep Going!

Zilla,

I've gone 15 miles past DTE pulling a 17K 5'er. Put about 25.74 gallons in that time. Didn't try to push it that far, just happened. I feel VERY confident I can drive EVERY tank 10 or so miles past DTE. A funny note, it seems to regularly happen that the truck starts a regen when I have 2-10 miles to empty...still don't run out. Good luck!
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Old 01-27-2013, 08:00 PM   #9 (permalink)
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I ran out with 27 MTE in my truck.
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Old 01-28-2013, 07:40 PM   #10 (permalink)
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Quote:
Originally Posted by Painted Horse View Post
Another thing you can look at is, Set your Trip A each time you fill up, It will display the gallons used since reset. I find this is very accurate, Usually with in 1/2 gallon of what I can put into the tank when I fill up. So regardless of what your miles to empty show, You can see how many gallons you used and know if you are getting to the bottom
I also use this method and have found it to be accurate within a 1/2 gallon or so.
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Old 01-28-2013, 09:24 PM   #11 (permalink)
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I also use this method and have found it to be accurate within a 1/2 gallon or so.
I always seem to pump a gallon or 2 more that what my gauge dash says I use. I am pumping from a tank in my driveway though the fuel is passing through 2 meters and they both calculate the same amount used. This also brings the hand calculated fuel economy down as well.
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Old 01-28-2013, 11:13 PM   #12 (permalink)
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How accurate is the fuel gauge?

I've driven to 0 miles to E and I'm still alive. I think it was 25.5 to fill. Close as I want to get. Lol


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Old 01-29-2013, 01:53 PM   #13 (permalink)
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Last summer I started tracking the MTE value when refueling. Data is in the spreadsheet via the link in my sig.
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Link: Fuel Mileage Spreadsheet With spreadsheet open click File then Download if you would like a copy of the spreadsheet.

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Old 01-29-2013, 10:54 PM   #14 (permalink)
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I don't follow the MTE. I use the gallons used and that has been spot on every time.
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Old 02-02-2013, 06:10 PM   #15 (permalink)
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From what I'm hearing, the display telling the number of gallons used is more accurate than the "Miles to empty". If so, I apparently don't get the tank full when I fuel up, though it appears that the fuel is at the top of the filler neck. Let me ask the question a different way... how much fuel is left in the tank when the "low fuel" light comes on? If there's a bigger reserve than I think, I could go farther between fillups.
Does anyone know?

Thanks.
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