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E60 (2004 - 2010)
BMW 5-Series (E60 chassis) was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E60 is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 05-23-2013, 06:15 AM
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Is my gas tank reading correct?

Hello all,

Since I own this car, I've never paid attention on the gas tank capacity. Just few days ago, the gas tank run down low ( 32mile) so I stopped by gas station and filled up. The gas pump stop at 11.5gal. I try to fill more in but the top-off protection at the pump keep pop-off. I finally got about 11.8gal in the tank. Starts engine, the gas guage showing full tank as it support to. So curious, I got home check out the gas tank capacity in the manual, it should be 18.5 gal (including 2.1 gal reserved). Why I filled only 11.8gal and it already full? is the guage reading correctly ?
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  #2  
Old 05-23-2013, 06:47 AM
whoever whoever is offline
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Did you drive a lot on local? I just recently noticed my mileage remaining dropped 10 every time I start the car and then drop by 1 for every block or every minute I drive. Then it's climb up 10-20 on highway.
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Old 05-23-2013, 07:01 AM
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Quote:
Did you drive a lot on local? I just recently noticed my mileage remaining dropped 10 every time I start the car and then drop by 1 for every block or every minute I drive. Then it's climb up 10-20 on highway.
I think you mis-understand my question. it's Not the mileage drops to 10 but the tank capacity kindda smaller than in the manual says . For E60, it should be 18.5gallons, but on my car I fill around 11.5gallons already full tank even I let the tank empty down to 30miles remain. So I don't know if the gas tank on my car is smaller or something else ...
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Old 05-23-2013, 09:37 AM
whoever whoever is offline
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Quote:
Originally Posted by vk535i View Post
I think you mis-understand my question. it's Not the mileage drops to 10 but the tank capacity kindda smaller than in the manual says . For E60, it should be 18.5gallons, but on my car I fill around 11.5gallons already full tank even I let the tank empty down to 30miles remain. So I don't know if the gas tank on my car is smaller or something else ...
I understand you perfectly.

I notice that miles to gas up drop like rock when I start and drive locally. More like drop 10 to start and then drop 1 for every 1/4 miles of local driving. So, if you drive a lot short local trips, the 32 remaining shown on computer could be way off. But I don't drive enough short local trips to prove if that's the case, or if the discrepancy accumulates with more local drive.
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Old 05-23-2013, 09:44 AM
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Originally Posted by whoever View Post
I understand you perfectly.

I notice that miles to gas up drop like rock when I start and drive locally. More like drop 10 to start and then drop 1 for every 1/4 miles of local driving. So, if you drive a lot short local trips, the 32 remaining shown on computer could be way off. But I don't drive enough short local trips to prove if that's the case, or if the discrepancy accumulates with more local drive.
I drive local lot more than highway. So it's seem like the gas gauge give out the fault info telling that only some miles left before tank empty but reality is maybe more than 5-6 gallons are remain in the gas tank.
this is odd !!!
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Old 05-23-2013, 12:40 PM
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Originally Posted by vk535i View Post
I drive local lot more than highway. So it's seem like the gas gauge give out the fault info telling that only some miles left before tank empty but reality is maybe more than 5-6 gallons are remain in the gas tank.
this is odd !!!
What did your gas gauge say when you only put 11.5 gallons in the car? I've noticed the same thing that the other people responding to this thread have said, that when you are driving around town, particularly if you are driving aggressively, your instantaneous mileage will be very low (<10 mpg), so your remaining range will drop as well. I've seen my remaining range go up from 30 or 40 miles to 70 or 80 miles if I go back on the freeway and drive at a reasonable speed (i.e., my instantaneous mileage goes up to 27 mpg or so).

Think of it this way. If you're only getting 7 mpg, then 7 gallons of gas (18.5 minus 11.5) will only take you 49 miles. BMW (and all other cars) have a fudge factor built in so that you don't immediately run out of gas when you have 0 miles remaining. Figure 2 gallons. So, now you only have 5 gallons of gas to use. 5 time 7 is 35 miles remaining.

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Old 05-23-2013, 01:03 PM
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Originally Posted by Campfamily View Post
What did your gas gauge say when you only put 11.5 gallons in the car? I've noticed the same thing that the other people responding to this thread have said, that when you are driving around town, particularly if you are driving aggressively, your instantaneous mileage will be very low (<10 mpg), so your remaining range will drop as well. I've seen my remaining range go up from 30 or 40 miles to 70 or 80 miles if I go back on the freeway and drive at a reasonable speed (i.e., my instantaneous mileage goes up to 27 mpg or so).

Think of it this way. If you're only getting 7 mpg, then 7 gallons of gas (18.5 minus 11.5) will only take you 49 miles. BMW (and all other cars) have a fudge factor built in so that you don't immediately run out of gas when you have 0 miles remaining. Figure 2 gallons. So, now you only have 5 gallons of gas to use. 5 time 7 is 35 miles remaining.

Keith
When the digital gauge shows 30 miles to the empty, I look at the analog gauge and the needle point at around 1/8 of the tank.
After filled up 11.8 gallons, my gas analog gauge needle pointed at FULL tank with remaining 420 miles on digital gauge. So it's seem the computer calculation kindda off if driving local with gas pedal on/off too much.
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Last edited by vk535i; 05-23-2013 at 01:07 PM.
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  #8  
Old 05-23-2013, 01:19 PM
johnniek johnniek is offline
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Is my gas tank reading correct?

Forget the miles to empty. His question is why the needle reads near empty but only took 11.8 gallons to complete full. It has to be a gauge issue. Local or highway is irrelovant.


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  #9  
Old 05-23-2013, 01:44 PM
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Put in two tank fulls of Techron. You might have a sulfur build up.

FWIW, with about an eighth left on the needle, you should need more than 11 gals. I just filled up with a quarter tank on the needle, and it took a bit over 11 gals.

http://www.techron.com/techron-concentrate-plus/
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  #10  
Old 05-23-2013, 01:47 PM
johnniek johnniek is offline
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Is my gas tank reading correct?

+1 on techron. Really helps fuel gauges.


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  #11  
Old 05-23-2013, 02:06 PM
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Quote:
Originally Posted by Kamdog View Post
Put in two tank fulls of Techron. You might have a sulfur build up.

FWIW, with about an eighth left on the needle, you should need more than 11 gals. I just filled up with a quarter tank on the needle, and it took a bit over 11 gals.

http://www.techron.com/techron-concentrate-plus/
Technically I put in 11.8 gallon on 1/8 of needle and I use Chevron gas and Texaco gas has Techron on it.
So the gauge reading maybe correct only the mile left is calculate wrong.
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  #12  
Old 05-23-2013, 03:37 PM
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+1 on techron. Really helps fuel gauges.


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Help me out here.....how will Techron help out a fuel gauge?

I agree that if the fuel gauge reads 1/8, and you're only putting 11.5 gallons in, something ain't right. I put close to 15 in with the gauge at 1/8.
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Old 05-23-2013, 05:20 PM
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Originally Posted by Campfamily View Post
Help me out here.....how will Techron help out a fuel gauge?

I agree that if the fuel gauge reads 1/8, and you're only putting 11.5 gallons in, something ain't right. I put close to 15 in with the gauge at 1/8.
As I understand it, sulfur can accumulate on the sending units, and Techron cleans that off.
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Old 05-23-2013, 05:30 PM
pjinca pjinca is offline
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Originally Posted by johnniek View Post
Forget the miles to empty. His question is why the needle reads near empty but only took 11.8 gallons to complete full. It has to be a gauge issue. Local or highway is irrelovant.


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LMAO, not quite. The analog gas gauge does NOT include the reserve 2.1 gals in it's calculation. This means at 1/8 it is not measuring the full 18.5 gals, it is measuring 16.4 gal. Also, the "digital" gauge measures based on "instant" mpg vs it's overall cumulative mpg reading. So you may very well have just needed 11.5 gals. The gauge is not there to allow you to run the tank dry, there's a reason why sometimes after a long highway drive my light will come on at 60 miles to empty. However, if I drive all local for a few days, it will come on at about 40 miles to empty. It happens. Also, NEVER let it get below 30 miles to empty, even your owners manual says that could lead to failure of the fuel pump.
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Old 05-23-2013, 07:07 PM
racooper3 racooper3 is offline
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LMAO too. Fubar post.
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  #16  
Old 05-23-2013, 07:30 PM
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Originally Posted by pjinca View Post
lmao, not quite. The analog gas gauge does not include the reserve 2.1 gals in it's calculation. This means at 1/8 it is not measuring the full 18.5 gals, it is measuring 16.4 gal. Also, the "digital" gauge measures based on "instant" mpg vs it's overall cumulative mpg reading. So you may very well have just needed 11.5 gals. The gauge is not there to allow you to run the tank dry, there's a reason why sometimes after a long highway drive my light will come on at 60 miles to empty. However, if i drive all local for a few days, it will come on at about 40 miles to empty. It happens. Also, never let it get below 30 miles to empty, even your owners manual says that could lead to failure of the fuel pump.
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Old 05-24-2013, 06:17 AM
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Quote:
Originally Posted by pjinca View Post
LMAO, not quite. The analog gas gauge does NOT include the reserve 2.1 gals in it's calculation. This means at 1/8 it is not measuring the full 18.5 gals, it is measuring 16.4 gal. Also, the "digital" gauge measures based on "instant" mpg vs it's overall cumulative mpg reading. So you may very well have just needed 11.5 gals. The gauge is not there to allow you to run the tank dry, there's a reason why sometimes after a long highway drive my light will come on at 60 miles to empty. However, if I drive all local for a few days, it will come on at about 40 miles to empty. It happens. Also, NEVER let it get below 30 miles to empty, even your owners manual says that could lead to failure of the fuel pump.
so technically my analog gauge measuring correct the amount of gas on the tank then. cuz when the needle point at 1/8 of the tank, I can put in 15.8 gal (this top off). I normally re_fill gas around 1/4 of the tank or more but lately last few times I let the gas went down almost empty then fill up and look at the receipts, once showed 11.5gal and another one showed 11.8 galon. Will try again few times
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Old 05-24-2013, 06:28 AM
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Originally Posted by vk535i View Post
so technically my analog gauge measuring correct the amount of gas on the tank then. cuz when the needle point at 1/8 of the tank, I can put in 15.8 gal (this top off). I normally re_fill gas around 1/4 of the tank or more but lately last few times I let the gas went down almost empty then fill up and look at the receipts, once showed 11.5gal and another one showed 11.8 galon. Will try again few times
The only thing you can prove by keep trying that is the toughness of your fuel pump
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Old 05-24-2013, 06:44 AM
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I just let the gas down to 1/8 of the tank. I don't think it may effect the fuel pump (and hope not)
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Old 05-24-2013, 07:08 AM
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In my opinion I think the gauge is reading incorrectly.
When the gas tank on my car gets empty like 20-15 I fill almost 18 gallons all the way to the cap (takes about 5 minutes)
last week I filled the tank with 100 octane it was 10$ a gallon
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Old 05-24-2013, 04:31 PM
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Originally Posted by GOR777 View Post
In my opinion I think the gauge is reading incorrectly.
When the gas tank on my car gets empty like 20-15 I fill almost 18 gallons all the way to the cap (takes about 5 minutes)
last week I filled the tank with 100 octane it was 10$ a gallon
$180 for one tank of gas? wow. How many miles will you get out of that tank of super-gas?
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Old 05-24-2013, 06:32 PM
schpenxel schpenxel is offline
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Originally Posted by GOR777 View Post
In my opinion I think the gauge is reading incorrectly.
When the gas tank on my car gets empty like 20-15 I fill almost 18 gallons all the way to the cap (takes about 5 minutes)
last week I filled the tank with 100 octane it was 10$ a gallon
Why?
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Old 05-24-2013, 06:34 PM
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cuz he is rich LOL
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Old 05-24-2013, 07:56 PM
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Why?
I was going to ask that too. I don't even run 100 oct with my mix, at most it is 95 oct for my 18 PSI map. Granted that V8 will not have a single knock or ping when going WOT.
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Old 05-25-2013, 05:59 AM
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$180 for one tank of gas? wow. How many miles will you get out of that tank of super-gas?
It was about $150, some 91 was in the tank when I filled up, really didn't looked at the miles but the gauge was reading 497. I am sure I didn't drive that much tho
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