| How do you know you're getting 91/92/93 octane for sure ?
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| mdxforever |
Is there any easy way of knowing the exact octane of the "premium" fuel you put in your tank ?
I can tell by the way it drives that there is a difference between 87 and 92, but is it really 87 and 92 ? How do we know its not 85 and 90 ? |
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| 04mdx4sq |
quote:
Originally posted by mdxforever
Is there any easy way of knowing the exact octane of the "premium" fuel you put in your tank ?
I can tell by the way it drives that there is a difference between 87 and 92, but is it really 87 and 92 ? How do we know its not 85 and 90 ?
http://en.wikipedia.org/wiki/Octane_rating
this should give you a basic on ratings, the ratings given are the minimum for that fuel. |
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| mdxforever |
well that doesn't really answer my question. I don't need a primer on octane but I want to find out how does an unsuspecting customer like you and me know if the gas station is not pumping 90 and charging you for 92 ?
Remember that scam when the gas station owner flips a switch and controls the pump "error". i.e. pump fills less than what it shows. He'd flip the switch to "normal" when the inspector shows up. |
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| G. COLTON |
There is no way that you, the consumer, can know the true octane of the fuel you are pumping. You would have to take a sample and send it to the lab to have it analysed.
Why would you be concerned? There is no way, short of extreme effort, that the station could change the octane if fuel. They would have to have some type of plumbing that would be used to mix diferent grades. Would not be worth the effort.
If you can tell the difference between grades when you drive the MDX you are more sensitive than most of us. I cannot tell any difference regardless of what octane I put in the tank.
G |
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| oilchange |
Advanced owners like mdxforever might be able to raise suspicion by checking spark advance while the car is running on some reproducible drive cycle on different fuels. If on a particular sample of gas there is audible knock, if you can electronically see if the knock sensor is much more active or if spark is retarded a great deal, there would be suspicion of lower octane.
I suppose this would not prove lower octane. One of the other methods would have to be used to prove it, such as running a special octane measuring engine. |
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| mdxforever |
G., read the first article/link. that will explain how its done.
oilchange, yes I did log some data and the numbers agree with the driving experience so there is definitely a "relative" difference in the octane but looks like there is no easy way of finding the "absolute" octane.
Now I'd be really confident buying premium fuel from the city of Farmingham - http://www.framinghamma.org/web/pag...ane_testing.htm |
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| G. COLTON |
quote:
Originally posted by mdxforever
G., read the first article/link. that will explain how its done.
oilchange, yes I did log some data and the numbers agree with the driving experience so there is definitely a "relative" difference in the octane but looks like there is no easy way of finding the "absolute" octane.
Now I'd be really confident buying premium fuel from the city of Farmingham - http://www.framinghamma.org/web/pag...ane_testing.htm
I have a salt shaker that puts out very large grains of salt. Comes in handy when reading stories like that.
G |
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| mdxforever |
| you talk like you're very confident this is false. why dont you enlighten us ? |
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