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Author: Subject: Short liters at Pemex
El Jefe
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[*] posted on 6-30-2014 at 08:03 AM
Short liters at Pemex


There have been several post on this subject, but I just had to pass on what happened yesterday in San Jose del Cabo at the Pemex on the four lane near Palmilla.

So I have the attendant fill my can to the 20 liter mark and look at the pump to see what it says before filling the car. Pump reads 23.2 liters. I point it out to the attendant with a smile and he looks at me straight faced and says, ''when it is hot like this the gas expands."

Oh, that explains it!

:lol:




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villafontana
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[*] posted on 6-30-2014 at 08:08 AM


Boyle's law!!! :lol::lol:
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chuckie
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[*] posted on 6-30-2014 at 09:01 AM


I knew that...



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[*] posted on 6-30-2014 at 10:12 AM


Actually he is correct.



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Cliffy
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[*] posted on 6-30-2014 at 10:57 AM


As the gas expands with heat maybe 19 liters will fill to the 20 liter point!
It's all measured by Specific Gravity with a temperature factor figured in to get the true gallons at a standard temperature. When we get fuel for the tanks at the airport we measure with a dip stick. The dip stick (just like the 20 liter jug) is measured in gallons at a given temp. The gallons go up as the fuel heats.
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bajalearner
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[*] posted on 6-30-2014 at 11:01 AM


Quote:
Originally posted by villafontana
Boyle's law!!! :lol::lol:


No, it is ladrone's law.
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villafontana
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[*] posted on 6-30-2014 at 11:07 AM


Quote:
Originally posted by bajalearner
Quote:
Originally posted by villafontana
Boyle's law!!! :lol::lol:


No, it is ladrone's law.


Yep!
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dtbushpilot
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[*] posted on 6-30-2014 at 11:13 AM


I have 6 identical gas cans that I use for my boat, I use 5 for diesel and 1 for water. They are white, the kind you see motorcycle racers use with the large threaded cap with a hose on it. They have graduated marks on the side for liters and gallons and being white you can clearly see the fluid level. The water can is pretty much new, hardly ever used while the diesel cans are well used.

I always stop the pump at 20 liters for each can and it is always a couple of liters shy of the 20lt mark, when I have pointed it out to the attendant they just shrug. Recently I started using the new can for fuel and to my surprise 20 liters of fuel on the pump showed 20 liters on the new can. Upon examination I could see that with age and use the other cans had expanded a bit.

I know there are pumps that aren't accurate but try not to put too much faith in the graduated markings on your gas can, they can be off a bit too. I use the new Pemex on the North end of Los Barriles.




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bajalearner
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[*] posted on 6-30-2014 at 11:21 AM


Interesting explanations.
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Cliffy
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[*] posted on 6-30-2014 at 11:32 AM


As I mentioned before, I measured all my gas purchases on my last trip down to Loreto. They all showed within what I felt was an acceptable amount of "error" on my can marks. Maybe a 1/4 inch or less on a 5 gallon (19 liter) mark. Could they have all been 1 liter short, maybe, but I doubt it. All the pumps I saw were new electronic ones.
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El Jefe
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[*] posted on 6-30-2014 at 11:33 AM


Quote:
Originally posted by Cliffy
As the gas expands with heat maybe 19 liters will fill to the 20 liter point!
It's all measured by Specific Gravity with a temperature factor figured in to get the true gallons at a standard temperature. When we get fuel for the tanks at the airport we measure with a dip stick. The dip stick (just like the 20 liter jug) is measured in gallons at a given temp. The gallons go up as the fuel heats.


Yes, looking at my now cool can of gas there are now 19 liters where yesterday at the station it was close to 20. But that is even worse since I paid for 23.2! Can't imagine my can is that far off accurate, but hey my love handles have expanded over the years, why not my gas can?




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JC43
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[*] posted on 6-30-2014 at 12:53 PM


Quote:
Originally posted by El Jefe
Quote:
Originally posted by Cliffy
As the gas expands with heat maybe 19 liters will fill to the 20 liter point!
It's all measured by Specific Gravity with a temperature factor figured in to get the true gallons at a standard temperature. When we get fuel for the tanks at the airport we measure with a dip stick. The dip stick (just like the 20 liter jug) is measured in gallons at a given temp. The gallons go up as the fuel heats.


Yes, looking at my now cool can of gas there are now 19 liters where yesterday at the station it was close to 20. But that is even worse since I paid for 23.2! Can't imagine my can is that far off accurate, but hey my love handles have expanded over the years, why not my gas can?


Jefe, u r asking the wrong question. The correct question is: How is it possible that my can is getting so empty?
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[*] posted on 6-30-2014 at 01:30 PM


Reminds of a time in Tecate. Stopped at a liquor store and grabbed a sixpak of TKT Rojo. Went to the register and the man gave me the price.
When I asked him why it cost more two blocks from where it was made, than in Ensenada, he just looked at me and said, "It's fresher."
Somewhere in Mexico is a book of replies for every occasion. :lol:




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chuckie
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[*] posted on 6-30-2014 at 01:35 PM


I suggest keeping your cans on ice, that way they will be smaller and you will get more fuel.



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[*] posted on 6-30-2014 at 02:17 PM


Who really cares? I know I don't. It is what it is....



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DENNIS
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[*] posted on 6-30-2014 at 02:43 PM


Quote:
Originally posted by Bajaboy
Who really cares? I know I don't. It is what it is....


Would you feel that way if it happened at a taco stand or the grocery store? Or is it just expected at gas stations.




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chuckie
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[*] posted on 6-30-2014 at 02:51 PM


Dennis!!!! I got us a money maker! Cans with sliding liter marks! Just adjust the marks on the can to match what you paid for! No mas problema..Be happy!



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[*] posted on 6-30-2014 at 03:44 PM


Sounds good, Chuckie. We could sell them to gas stations.



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El Jefe
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[*] posted on 6-30-2014 at 03:49 PM


Perfect! Feeling better all ready.



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Bob and Susan
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[*] posted on 6-30-2014 at 04:25 PM


maybe first you should fill the container with a "real" 20 ltrs

then mark that amount on the container

then complain

otherwise no one really knows what you got

liter.jpg - 4kB




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