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do we really have 18.5 gallon gas tanks?

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Old 08-27-2010, 09:18 AM
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do we really have 18.5 gallon gas tanks?

seriously i dont see how. i have filled up from dead empty and only held 16.5 gallons.


im trying to figure out how many MPG im getting i got 450 miles out a complete full tank but i know it wasnt 18.5 gallons.


thanks guys.
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Old 08-27-2010, 09:29 AM
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Well, if you put in 16.5 gallons, and went 450 miles....it doesn't matter how big the tank is, does it.
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Old 08-27-2010, 09:32 AM
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i thought 15
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Old 08-27-2010, 10:22 AM
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I put 17.5 gallons in my tank last week. I probably went 30 miles past the low fuel light
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Old 08-27-2010, 10:43 AM
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just like how it goes above F, the reserve 2 gallons is below E. I ran on fumes for a minute once and filled up to 17.9
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Old 08-27-2010, 10:46 AM
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thats weird how we all have different sizes. im just trying to figure out exactly how much they hold. i didnt look at the gallons when i last filled it cause it still had a quarter tank.

about what MPG is that if i got 435 miles till the fuel light came on.
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Old 08-27-2010, 10:58 AM
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Originally Posted by TravisCadello
thats weird how we all have different sizes.
I don't think we have different sized tanks, most of use aren't about to run out of gas to figure out how many gallons it will hold.
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Old 08-27-2010, 11:10 AM
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Originally Posted by TravisCadello
thats weird how we all have different sizes. im just trying to figure out exactly how much they hold. i didnt look at the gallons when i last filled it cause it still had a quarter tank.

about what MPG is that if i got 435 miles till the fuel light came on.
It's not very precise to judge the amount of fuel used by when the light comes on. A much simpler method is fill up your tank and reset your trip odometer, drive for a couple hundred miles, then fill up your tank again. The amount of gas put in your tank the second time will be equal to the amount used since the last fuel up. Because you reset your trip odometer as you were leaving the gas station after the first fill up, the distance driven on that amount of fuel will be equal to the number of miles show on the trip odometer. Divide the number of miles driven by the amount of fuel used to get miles per gallon.
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Old 08-27-2010, 11:12 AM
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I wouldnt recommand to run on low fuel just to try how much fuel your tank can hold...
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Old 08-27-2010, 11:17 AM
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If nissan says it 18.5 I would think its 18.5. Just sayin.
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Old 08-27-2010, 11:21 AM
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low gas light? i dont know if that light works on my car, never that low on gas

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Old 08-27-2010, 11:30 AM
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I keep mine at a 1/4 tank for weight reduction but the light never comes on.
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Old 08-27-2010, 01:15 PM
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prob a 18.5 gallon. Once you subtract the gas you use for idleing and stop lights and signs lol.
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Old 08-27-2010, 02:07 PM
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iv'e never had to put in more than 16 gallons, even with the low fuel light on! but i do beleive it is an 18.5 gallon tank
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Old 08-27-2010, 03:20 PM
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i filled up my car today and on nothing but pure in town driving(and driving the hell outta it) i filled it up with 13.3 gallons and i only had 250 miles on what i had used..but my gas gauge is stuck in the full position so i cant tell how low it was.. (i just ordered another cluster from teaner) so that i can have a non-chihuahua-having a seizure tach.. seriously i showed my buddy the car the other day and i had the bose HU just put in and he asked me if i wired it up to the radio to flicker lol
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Old 08-27-2010, 03:49 PM
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Originally Posted by ajcool2
I keep mine at a 1/4 tank for weight reduction but the light never comes on.
buying gas everyday must suck for you.
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Old 08-27-2010, 03:52 PM
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Originally Posted by cashoit
low gas light? i dont know if that light works on my car, never that low on gas

Get the gauge to stay on E and park on a very steep hill with the front of the car pointing up. Wait for the engine to get cold and then start the car. Then you will know if it works or not.

I thought the same thing until the same thing happened to me last week.
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Old 08-27-2010, 03:54 PM
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lol this thread is great ... reading it i think i just lost a couple IQ pts!

... but it was worth it for the laugh!
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Old 08-27-2010, 05:01 PM
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Originally Posted by ajm8127
A much simpler method is fill up your tank and reset your trip odometer, drive for a couple hundred miles, then fill up your tank again. The amount of gas put in your tank the second time will be equal to the amount used since the last fuel up. Because you reset your trip odometer as you were leaving the gas station after the first fill up, the distance driven on that amount of fuel will be equal to the number of miles show on the trip odometer. Divide the number of miles driven by the amount of fuel used to get miles per gallon.

QFT. It doesn't matter how big the tank is.

Math is your friend!
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Old 08-27-2010, 05:32 PM
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my gas light has gone on once and ill never let it happen again. ive run out of gas once without the gas light turning on so im always afraid of it getting to the light!
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Old 08-27-2010, 05:42 PM
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Don't come around and try to gas me up I like runnin' on E

But for real I run on 1/4 tank, E and under all the time, I know its probably not the best, but there must be a pretty descent sized reserve gas tank. And I would definitely bet that some gas stations jip you on gas, I know some ppl in the business lol... And have heard stories. So unless you measure it yourself don't trust the pump.
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Old 08-27-2010, 06:21 PM
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Yes it is 18.5 gallons. If you want to get full capacity, you gotta find a gas station that is on a hill and have it tilt. I have filled right up and did over 18 gallons.
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Old 08-27-2010, 06:24 PM
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dont run under 1/4 empty, preferably over 1/2 a tank. if the fuel level gets too low sediment and crap gets pushed through your fuel pump and wreck it
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Old 08-27-2010, 07:34 PM
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Originally Posted by chrome91
dont run under 1/4 empty, preferably over 1/2 a tank. if the fuel level gets too low sediment and crap gets pushed through your fuel pump and wreck it
Yep, if you actually took the time to read the manual, it says running with too little gas can actually pop a CEL.

Fuel tank capacity isn't really a major selling point for cars, don't really see why Nissan would have to lie about it. However, If you have dented tank, that might reduce capacity.
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Old 08-27-2010, 07:35 PM
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Originally Posted by Kretzmech
And I would definitely bet that some gas stations jip you on gas, I know some ppl in the business lol... And have heard stories. So unless you measure it yourself don't trust the pump.
I'm in the business. You know Gilbarco and GasBoy PM's?
Stories are for kids.

The variance of the fuel dispensed, including adjustments by the ATC, is MUCH less than the variables involved in consumer based MPG calculations.
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Old 08-27-2010, 07:36 PM
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Originally Posted by chrome91
dont run under 1/4 empty, preferably over 1/2 a tank. if the fuel level gets too low sediment and crap gets pushed through your fuel pump and wreck it
The pick up is at the bottom of the tank regardless of the volume of fuel; there is no floating pickup i.e. it's always sucking off the bottom.
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Old 08-27-2010, 08:15 PM
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i've gone through this before.
my 3rd gen you can drive a day and a 1/2 with the a/c and hard driving, with the gas light on.

the q45 the same thing.

the 4th gen.
i get 11 miles before i'm out.
and when i put gas back in...lets say 3 gallons worth, it ends up at the 1/4 mark.
the same thing would apply to the 3rd gen, if i let the light come on and drive about 10-15 miles.

then i knew something was wrong when my dad (who has a 97) and kevin who has a 98 drove for about 40 miles while on e.
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Old 08-28-2010, 05:14 PM
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This thread is retarded. As ajm8127 said, it's just simple math. Don't they teach division in elementary school anymore?

On a related note I changed my fuel filter after driving to Dallas last week. I filled up the next day and calculated about 23 mpg for that tank. I filled up a few days ago and got over 27 mpg from the last tank with nearly identical driving. If you haven't changed your fuel filter in a while or like don't know when (or if ) it was last changed like me...it can be well worth the effort.
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Old 08-28-2010, 08:55 PM
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My friend has a 98 max with 230k+ and hasnt changed his fuel pump, or anything liek that and he runs on 1/4 every week. Im not saying its a good thing to do, just stating how awesome Maximas are.
Blooloolooloo
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Old 08-28-2010, 10:49 PM
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The tank size has nothing to do with finding your MPG. To calculate your MPG, simply fill your car till the trigger stops and RESET your Trip. Then drive for a few days until you have 1/2 a tank or 1/4 or whatever, Then fill it up again. Now take the miles you drove (on your trip) and divide it by the number of gallons that it took to refill the tank.

Example: Lets say you drive 225 miles and then it takes 9.46 gallons to refill it.... 225 / 9.46 = 23.78 MPG

Good Luck!


96 SE 5-Speed Manual... Little bit here and there...
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Old 08-29-2010, 06:50 AM
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When did they stop teaching math in schools?
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Old 08-29-2010, 10:57 AM
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How is this thread this long????? and not locked yet?
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Old 08-29-2010, 11:18 AM
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so if i got 435 miles out of full tank even know i think i only pumped in 16 gallons and im sure it was empty then should i do 435 divided into 16 or 18.5? lol i know our gas gauges go REALLY low i've had mine way under the E line and never ran out lol.
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Old 08-29-2010, 12:13 PM
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Originally Posted by TravisCadello
so if i got 435 miles out of full tank even know i think i only pumped in 16 gallons and im sure it was empty then should i do 435 divided into 16 or 18.5? lol i know our gas gauges go REALLY low i've had mine way under the E line and never ran out lol.
Just so I'm clear: You're claiming you're sure the tank was empty, but you didn't run out of gas?
What exactly does "empty" mean?

Sounds to me like you used 16 gallons to go 435 miles.
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Old 08-29-2010, 01:02 PM
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seriously?
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