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Old 12-05-2008, 12:15 PM   #1
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Gas Consumption?

Can you tell your Gas Consumption?

Thanks

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Old 12-05-2008, 12:32 PM   #2
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fill "x" amount of gas, set the trip setting on the odometer. take the total amount of miles to burn up the gas. now take the number of miles and divide that by "x"(number of gallons of gas). so if you put in 12 gallons of gas and it took 200 miles to burn it up you take 200 and divide by 12 and you get about 16 miles to the gallon.

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Old 12-05-2008, 01:12 PM   #3
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I get 18-19 if I keep it at 65 and under, no A/c utilization, no extra passengers, and no 4x4. But with gas under 1.55 @ gallon it's time to party.
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Old 12-05-2008, 01:17 PM   #4
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Sorry I think my question is not correct but thanks for the info :P, I want to know how many milles does your jeep last with a full tank? in city or highway.

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Old 12-05-2008, 02:18 PM   #5
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i get around 190 miles out of a tank on the highway and 11 or 12 city, and i think its a 13 gallon tank.
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Old 12-05-2008, 03:12 PM   #6
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My '06 has a 19 gallon tank and I usually fill it after about 200 miles. I don't let it get too low before topping it off. By running it to almost empty you take head pressure (suction pressure) from the fuel pump, which labors it more and can lead to early pump failure. Just my 2 cents.
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Old 12-05-2008, 03:33 PM   #7
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I do not think that is true, I drive 100 miles a day commuting to work, I go 3 days before stopping for gas and it pretty empty. My TJ is 4.5 years old and knock on wood it just cranks along. My YJ has the original pump after 200k under those same conditions.
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Old 12-05-2008, 03:34 PM   #8
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I get 260 miles to a tank, but I am not sure that it is the whole tank. Thats basically when the dummy light comes on. I read somewhere that most TJ's have a 19 gallon tank but the filler neck is shorter making you think it only holds 15. I believe the dummy light comes on when you have consumed 14 gallons, not quite sure. All I know is when I pump it puts in 15 gallons, but hell, we all know how accurate the pumps are.....
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Old 12-05-2008, 04:12 PM   #9
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I do not think that is true, I drive 100 miles a day commuting to work, I go 3 days before stopping for gas and it pretty empty. My TJ is 4.5 years old and knock on wood it just cranks along. My YJ has the original pump after 200k under those same conditions.

All I am saying is a pump with higher head pressure labors less than one without. You fill your tank every 3 days...so you are not low on fuel for very long. Fuel pumps are like anything else mechanical, you can try to do everything that's recommended and still have a failure. On the other hand you can abuse some equipment and, somehow, it still lasts forever. I've seen engines go over 200,000 miles that maybe saw 6 oil changes and others fail with regular maintenance. I'm just offering a tip to help prolong the life fuel pumps. Another issue of running your tank real low is picking up sediments that have settled to the bottom of the tank over the years.
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Old 12-05-2008, 06:48 PM   #10
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Mooseman,

I understand what your saying, but stopping for gas every 2 days is a bigger drag than every 3. But I do change my oil and filter every 3k regardless of the weather here in northern NJ. Which reminds me I have 8 gallons of used oil to take to the recycling center.

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Old 12-05-2008, 08:13 PM   #11
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Originally Posted by wicho001 View Post
Can you tell your Gas Consumption?
Yes, I can. There's a gauge on the dashboard that is very helpful.
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Old 12-05-2008, 08:23 PM   #12
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Here's my .02$:
Never run out of fuel, gas actually lubricates the pump.

Dry gas in the tank twice a year.

Add 4 oz. of Marvel Mystery oil every 3,000 miles. (also may help clean your intake valves)
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Old 12-05-2008, 08:47 PM   #13
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Mooseman,

I understand what your saying, but stopping for gas every 2 days is a bigger drag than every 3. But I do change my oil and filter every 3k regardless of the weather here in northern NJ. Which reminds me I have 8 gallons of used oil to take to the recycling center.

Thanks.
I understand what you're saying too, I guess the point I'm trying to make is don't drive for extended periods of time with your tank near empty. I know people who drive between 1/4 full and empty and then just put in 5 bucks worth and continue with this cycle. Maintaining a very low fuel level over time will put an increased load on the pump. And just for the record, I in NO WAY was implying that you don't properly maintain your equipment. If you did, you wouldn't be on this awsome forum.
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Old 12-05-2008, 08:57 PM   #14
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Quote:
Originally Posted by Jma20a View Post
fill "x" amount of gas, set the trip setting on the odometer. take the total amount of miles to burn up the gas. now take the number of miles and divide that by "x"(number of gallons of gas). so if you put in 12 gallons of gas and it took 200 miles to burn it up you take 200 and divide by 12 and you get about 16 miles to the gallon.
if you fill it X amount of gas, how do you know exactly how much you have in there before? Perhaps i'm not getting what you are saying.. anyhow..

You fill your tank up until the pump clicks off automatically. Reset your odometer and drive.. whenever you feel like filing up (light turns on or whatever), fill it up and remember how much you fill up (again pump clicks off automatically)

Look at your odometer, take that number and divide it by how much you just filled up.. that is your mpg.

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Old 12-05-2008, 08:59 PM   #15
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Hey Atthehop...with you being in norther NJ, you have the same cold weather that we have here in Wyoming. So another benefit of keeping a full tank is to reduce the open space that allows for condensation of water in your fuel tank.
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Old 12-06-2008, 10:54 AM   #16
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if you fill it X amount of gas, how do you know exactly how much you have in there before? Perhaps i'm not getting what you are saying..
i just made a mental note of where the needle on the gauge was and went form there.
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Old 12-06-2008, 12:43 PM   #17
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It's pretty dry out here, espically in the winter and I never had condensation issues. I usually fill it up on the way home after the third day so it rarely sits very long on "E".
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Old 12-06-2008, 12:58 PM   #18
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Quote:
Originally Posted by Jma20a View Post
i just made a mental note of where the needle on the gauge was and went form there.
thats not that exact... you have at least a gallon margin of error like that..
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Old 12-06-2008, 01:44 PM   #19
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thats not that exact... you have at least a gallon margin of error like that..
i never said it was perfect, but does give you a good idea of your millage
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Old 12-06-2008, 09:30 PM   #20
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wao! thanks alot guys! Just getting prepared
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Old 12-06-2008, 10:02 PM   #21
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I'm not a tech guy, but my mechanic once told me to always keep a quarter tank of gas as a minimum. He said that because the fuel pump is inside the tank, the pump needs to be submersed in gas to help cool it off. Otherwise, the pump can overheat which would shorten it's life. That was on my wife's Mustang, but I imagine the same applies here.
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Old 12-06-2008, 10:11 PM   #22
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It's pretty dry out here, espically in the winter and I never had condensation issues. I usually fill it up on the way home after the third day so it rarely sits very long on "E".
I'm sure it is dry out there, NJ being close to the coast. Here in Wyoming we are at least 1000 miles away from the nearest coast line. Not to mention that we are also around a mile and a half above (Altitude) the nearest coast and experience 60 mph winds regularly and host the Great Red Desert. So I'm guessing it might be drier out here. But condensation mostly happens with temperature changes, not humidity. Again, all I am saying is a pump with high suction pressure WILL outlast a pump with low suction pressure. I made my living for the last 15 years working on pumps, and they all work alike. It doesn't matter what type, centrifugal, reciptical...what ever, if they labor less....they last longer. I'm not saying you are doing anything wrong, I explained that in my previous post. I think since you fuel up every 3 days, you run "on empty" very little. I think we think the same way, but we're having difficulty conveying that to each other.
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Old 12-06-2008, 10:26 PM   #23
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I'm not a tech guy, but my mechanic once told me to always keep a quarter tank of gas as a minimum. He said that because the fuel pump is inside the tank, the pump needs to be submersed in gas to help cool it off. Otherwise, the pump can overheat which would shorten it's life. That was on my wife's Mustang, but I imagine the same applies here.
You got it!
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Old 12-07-2008, 07:34 AM   #24
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Fisher5d has a good point, that may be why when I fill it from empty it only takes 15 gallons in a 19 gallon tank. There are 4 gallons in the bottom to keep the pump submerged.
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Old 12-07-2008, 01:44 PM   #25
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Fisher5d has a good point, that may be why when I fill it from empty it only takes 15 gallons in a 19 gallon tank. There are 4 gallons in the bottom to keep the pump submerged.
Or your fuel gauge isn't accurate. There is no designed "conservation pool" of gas to protect your pump....you can still run it dry if you're not careful.
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Old 12-07-2008, 02:16 PM   #26
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there is a tiny dimple on the bottom of the tank where the bottom end of the pump goes but that is there so if you are running it to the end (low fuel), its easier for the fuel pump to have the fuel since it's directed.

When my light fills up i always fill up about 15.5-16 gallons.. > i have 3-3.5 gallons in the tank left.
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Old 12-07-2008, 02:39 PM   #27
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mooseman is right about what he has said. even about some mechanical parts lasting for no good reason, and others going out for no good reason

the theories are correct, gas cools the electric pump, the actual pump is about 8" above the pick up, somewhere around a quarter tank is what is gonna keep most pumps completely submerged.

every gas tank with any miles in it has junk sitting on the bottom of the tank, when you run it low it is more likely to pick that junk up than having abundant source of gas to pull. all pumps have a filter on the pick up (we call it a sock) and they all get full of crap from the tank, without them fuel pumps wouldn't last a few months.

and just by pure gravity if it is fuller, it takes less to pick up the gas.

so to sum it up, running low on gas is bad for pumps. some pumps last forever, and some only last a couple years at a time, regardless of what you do. if you wanna do all you can in your favor, don't run it very low. i fill up a little under a quarter usually.
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Old 12-07-2008, 03:01 PM   #28
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Can you tell your Gas Consumption?
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11 mpg in the city in the rush hour.
14 mpg on the highway at 65 mph and cruise control.
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Old 12-08-2008, 08:40 PM   #29
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mooseman is right about what he has said. even about some mechanical parts lasting for no good reason, and others going out for no good reason

the theories are correct, gas cools the electric pump, the actual pump is about 8" above the pick up, somewhere around a quarter tank is what is gonna keep most pumps completely submerged.

every gas tank with any miles in it has junk sitting on the bottom of the tank, when you run it low it is more likely to pick that junk up than having abundant source of gas to pull. all pumps have a filter on the pick up (we call it a sock) and they all get full of crap from the tank, without them fuel pumps wouldn't last a few months.

and just by pure gravity if it is fuller, it takes less to pick up the gas.

so to sum it up, running low on gas is bad for pumps. some pumps last forever, and some only last a couple years at a time, regardless of what you do. if you wanna do all you can in your favor, don't run it very low. i fill up a little under a quarter usually.
Thanks Dave!....I don't know why I kept trying to convince the unconvinceable.

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