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Does anybody know what octane Mexican premium is?  Rate Topic 
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 Posted: Thu Aug 15th, 2019 12:30 am
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Quido
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?

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 Posted: Thu Aug 15th, 2019 04:23 pm
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Bullshipper
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supposedly 92

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 Posted: Thu Aug 15th, 2019 05:47 pm
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JCB
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Why are you asking the question?  



The first thing is that if your owner's manual doesn't say that you need high octane fuel, then you don't need it and using high octane fuel is just a waste of money. 


If your engine is knocking, there are a number of possible causes in addition to low octane fuel.  Wrong spark plugs, wrong gap, timing, etc etc.  Also various mechanical problems can result in a knocking sound that has nothing to do with the fuel.  If that is the case, it needs to be fixed asap.



If you are concerned about the fuel, one thing you could try is to add an octane booster available at e.g. Autozone and see if the pinging stops.  That should rule out other mechanical problems but it still could be the spark plugs.

Last edited on Thu Aug 15th, 2019 06:00 pm by JCB

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 Posted: Thu Aug 15th, 2019 06:17 pm
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frankie
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the octane level has always been a question here as to what is advertised and actuality! since the new gas companies have entered, Arco, Chevron, Gulf i have noticed better fuel efficiency with me using Arco gas! ALL PEMEX gas used in all the northern Mexican states is refined in the USA! the main difference using NOB brands is the consistency of the octane level and the use of ADDITIVES!!!

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 Posted: Thu Aug 15th, 2019 06:19 pm
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Ask some people what time it is and they will tell you how to make a watch. But, thanks for your concern JCB.

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 Posted: Sun Aug 18th, 2019 09:50 pm
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Hook
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frankie wrote: the octane level has always been a question here as to what is advertised and actuality! since the new gas companies have entered, Arco, Chevron, Gulf i have noticed better fuel efficiency with me using Arco gas! ALL PEMEX gas used in all the northern Mexican states is refined in the USA! the main difference using NOB brands is the consistency of the octane level and the use of ADDITIVES!!!

Funny how efficiency increases when you start getting legitimate quantities, instead of what most Pemex stations deliver.

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 Posted: Sun Aug 18th, 2019 11:04 pm
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frankie
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the Arco station here and Fletcha gas stations offer a calibrated beaker to measure the liters of gas purchased if there is ANY question regarding quantity!  

Attached Image (viewed 200 times):

beeker.jpg

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 Posted: Sun Aug 18th, 2019 11:40 pm
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RichD
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I had an Audi that was very sensitive to using anything but premium. Any modern car will compensate if it detects preignition by backing off the timing so it is doubtful you will hear knocking. More likely loss of performance and poor fuel economy. The Audi ran just fine on Mexican premium. Expensive though. Milage was the same and based on the computer, not the amount of fuel shown on the pump. If you are worried about harming a high performance car, I don't think you have to worry.

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 Posted: Mon Aug 19th, 2019 01:33 am
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Hook
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frankie wrote: the Arco station here and Fletcha gas stations offer a calibrated beaker to measure the liters of gas purchased if there is ANY question regarding quantity!  

This is probably the best reason that foreign oil companies were allowed into the Mexican market. Great to see this!!

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 Posted: Mon Aug 19th, 2019 06:57 am
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Beakers have been required tobbe present at all Pemex gas stations for over 20 years.

However, the pumps can be controlled electronicaly to dispense less gas before or after you take a measurement.

Nafta concessions for foriegn gas stations were part of that agreement too.

In fact sometimes the owner will place a micro switch under a pad so that the pumps only steal when the test flask is on top of the switch turning it on to position the second steal gear with fewer teeth pushing the the piston measuring pump.

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 Posted: Mon Aug 19th, 2019 02:34 pm
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Hook
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Bullshipper wrote: Beakers have been required tobbe present at all Pemex gas stations for over 20 years.

However, the pumps can be controlled electronicaly to dispense less gas before or after you take a measurement.

Nafta concessions for foriegn gas stations were part of that agreement too.

In fact sometimes the owner will place a micro switch under a pad so that the pumps only steal when the test flask is on top of the switch turning it on to position the second steal gear with fewer teeth pushing the the piston measuring pump.


What a great Freudian slip!

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 Posted: Mon Aug 19th, 2019 02:45 pm
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frankie
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Bullshipper wrote:
In fact sometimes the owner will place a micro switch under a pad so that the pumps only steal when the test flask is on top of the switch turning it on to position the second steal gear with fewer teeth pushing the the piston measuring pump.


really? that would require a solenoid that is attached to a remote control or direct contact switch, to engage the gears! the remote control would require a radio transceiver and antenna. 
* the Arco station here has 4 islands servicing on each side, 8 pump spigots for regular, 8 pump spigots for premium, 8 metered gauges!
* the remote would also have to have 8 different signals for the 8 different gauges
* seems very complicated and something that would be easily seen!
i guess anything is possible, if it's all about the pesos for profit!


P.S. since the owner does not pump the gas ALL the attendants would have to be in on the scam! there goes the profit! most the attendants in town take the bus to work!
i have no doubt these where once common unscrupulous  practices, hopefully those practices will be a thing of the past!


i have a trip meter on my 2001 cherokee, i know how many miles i have traveled and how they where traveled. when i arrive the station i take out my calculator and KNOW EXACTLY how much fuel i will use and how much i will pay!!!! it works perfect every time!!!!

Last edited on Mon Aug 19th, 2019 04:48 pm by frankie

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 Posted: Mon Aug 19th, 2019 06:52 pm
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Bullshipper
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Hook wrote: Bullshipper wrote: Beakers have been required tobbe present at all Pemex gas stations for over 20 years.

However, the pumps can be controlled electronicaly to dispense less gas before or after you take a measurement.

Nafta concessions for foriegn gas stations were part of that agreement too.

In fact sometimes the owner will place a micro switch under a pad so that the pumps only steal when the test flask is on top of the switch turning it on to position the second steal gear with fewer teeth pushing the the piston measuring pump.


What a great Freudian slip!
fat fingers, small phone.

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 Posted: Mon Aug 19th, 2019 07:05 pm
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Bullshipper
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frankie wrote: Bullshipper wrote:
In fact sometimes the owner will place a micro switch under a pad so that the pumps only steal when the test flask is on top of the switch turning it on to position the second steal gear with fewer teeth pushing the the piston measuring pump.


really? that would require a solenoid that is attached to a remote control or direct contact switch, to engage the gears! the remote control would require a radio transceiver and antenna. 
* the Arco station here has 4 islands servicing on each side, 8 pump spigots for regular, 8 pump spigots for premium, 8 metered gauges!
* the remote would also have to have 8 different signals for the 8 different gauges
* seems very complicated and something that would be easily seen!
i guess anything is possible, if it's all about the pesos for profit!


P.S. since the owner does not pump the gas ALL the attendants would have to be in on the scam! there goes the profit! most the attendants in town take the bus to work!
i have no doubt these where once common unscrupulous  practices, hopefully those practices will be a thing of the past!


i have a trip meter on my 2001 cherokee, i know how many miles i have traveled and how they where traveled. when i arrive the station i take out my calculator and KNOW EXACTLY how much fuel i will use and how much i will pay!!!! it works perfect every time!!!!
 
One switch engages all pumps same time, usually hard wired. Air injection was another old trick to send less gas, as well as small copper return lines to the tank, after the gas was measured.


But I think that the Flecha chain is now pumping the right amounts, and have no idea if others have gone honest now after Pemex let them raise their prices. 


Inspectors were paid 3% of the total sales for the first days of the month by each station that was cheating to turn a blind eye, so I doubt they just gave up on their slush fund after so many years of living the high life. Pemex has always been a cash cow for the dishonest that operate and regulate it. Typically, stations dispensed 945 ml(Qts) and we paid for 1000 ml liters.


Stolen gas at the pump never paid IVA to the government either, so this may be a loop hole the government will try to close, someday. Stolen Gas from the pipelines is really another tax, as we pay more for gas to make up for Pemex losses, and actually pay a monthly stipend of about $8,000 per month the the robbers, in the hope they will stop stealing, but cartels continue to fill truck loads to compensate for lost marijuana sales to the US since legalization started taking a bite out of their coffers.

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 Posted: Mon Aug 19th, 2019 07:08 pm
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Bullshipper
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Bullshipper wrote: Hook wrote: Bullshipper wrote: Beakers have been required tobbe present at all Pemex gas stations for over 20 years.

However, the pumps can be controlled electronicaly to dispense less gas before or after you take a measurement.

Nafta concessions for foriegn gas stations were part of that agreement too.

In fact sometimes the owner will place a micro switch under a pad so that the pumps only steal when the test flask is on top of the switch turning it on to position the second steal gear with fewer teeth pushing the the piston measuring pump.


What a great Freudian slip!
no slip this time Hook, one gear is honest the second with less teeth steals,and  both are custom made out of molded nylon.

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