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Old 07-03-2011, 03:44 PM   #1 (permalink)
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89 + 93 octane = 91 octane gas?

can I put half tank with 89 and the other with 93 making it 91 octane gas?
its only 87,89,and 93 octane gas here, no 91

I don't mind putting 93 , however I feel I can drive with the above combination without any negative effects, if not towing or utilizing the max performance of the vehicle.. just wondering if this combination is ok

Please let me know if anyone has any suggestions, I don't think I need 93 all the time.
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Old 07-03-2011, 04:07 PM   #2 (permalink)
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can I put half tank with 89 and the other with 93 making it 91 octane gas?
Yes, it pretty much works out like that providing it mixes well. Mixing probably not an issue on the 1st GEN what with its fuel sloshing and all.

In these parts we have 87, 89, and 91 and are usually priced $.10 apart. What is the average price difference for your grades? Just curious.
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Old 07-03-2011, 04:38 PM   #3 (permalink)
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What is the average price difference for your grades? Just curious.
its almost the same (around 10-15 Cents between grades ) since there is no 91, between 89 and 93 its around 25 cents
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Old 07-03-2011, 05:22 PM   #4 (permalink)
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can I put half tank with 89 and the other with 93 making it 91 octane gas?
...
Mixing gas is a good idea for the MDX if you have 93 Octane and stay above required set point of 91 Octane (89 + 93 = 91}.
I do it often ... not because of cost ... because of the additives used.
I do it to burn better and have reduced adverse effect of ethanol and detergents.
See adverse effects of ethanol / detergents in Costco Post ...

There are actually 4 differ Octane Grades that use the word Premium {89, 91, 93, 95}.
Some folks here dont know that ...
I wonder if they know what Ethyl or Super mean ???
If 91 Octane was not good your all 40 million folks would be internal damnation.
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Old 07-03-2011, 05:32 PM   #5 (permalink)
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Originally Posted by EL_PIC View Post
Mixing gas is a good idea for the MDX if you have 93 Octane and stay above required set point of 91 Octane (89 + 93 = 91}.
I do it often ... not because of cost ... because of the additives used.
I do it to burn better and have reduced adverse effect of ethanol and detergents.
See adverse effects of ethanol / detergents in Costco Post ...

West coast people dont have the option of 93 Octane and 95 is hard to find.
I still don't understand the advantage of mixing pertaining to ethanol/detergents.

Costco says the same detergents are used in all grades. Around here all gas has 10% ethanol. So if it's not cost, why not just use 93?
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Old 07-04-2011, 12:44 AM   #6 (permalink)
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Aside from price, there is no advantage to using anything less than premium. And you can damage your engine by using less than 91 octane.

If you want to mix 89 and 93 to get 91, you can, but it's a huge inconvenience for not much gain.

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There are actually 4 differ Octane Grades that use the word Premium {89, 91, 93, 95}.
Not true. Throughout the United States and Canada, the word premium refers to gasoline with octane of 91 or higher. 89 octane is not premium anywhere; it is sold as "mid-grade". Premium gas sold in the United States is almost always 92 or 93 octane east of the Rockies, and 91 in the Rockies and the West. Some Sunoco stations sell two grades of premium, with the higher called "Ultra 94" (94 octane). Some stations sell super-high racing gas with octane of 100 or higher. I have never seen 95 octane gas anywhere in the United States.

Note that North America labels its gas pumps with what is properly known as the "anti-knock index", which is the average of the research octane number and the motor octane number (i.e. [RON+MON]/2). In other parts of the world, such as Australia and Europe, pumps are labeled with the research octane number, which is 4-5 points higher than the U.S. anti-knock index for the same fuel.
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Old 07-04-2011, 08:48 AM   #7 (permalink)
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89 + 93 = 91 makes perfect $$$ sense and clean burn but note the words Premium, Regular, Plus, Super, etc are going away. 93 may also go away per recent EPA request. E15 is comming and if you want higher Octane or no Ethanol move or buy 95 at commuter airpark.

The Low-Down on High Octane Gasoline
Are you tempted to buy a high-octane gasoline for your car because you want to improve its performance? If so, take note: the recommended gasoline for most cars is regular octane. In fact, in most cases, using a higher octane gasoline than your owner’s manual recommends offers absolutely no benefit. It won’t make your car perform better, go faster, get better mileage or run cleaner. Your best bet: listen to your owner’s manual.
The only time you might need to switch to a higher octane level is if your car engine knocks when you use the recommended fuel. This happens to a small percentage of cars.
Unless your engine is knocking, buying higher octane gasoline is a waste of money, too. Premium gas costs .15 to .20 cents per gallon more than regular. That can add up to $100.00 or more a year in extra costs. Studies indicate that altogether, drivers may be spending hundreds of millions of dollars each year for higher-octane gas than they need.
What Are Octane Ratings?
Octane ratings measure a gasoline’s ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders. Most gas stations offer three octane grades: regular, usually 87 octane, mid-grade, usually 89 octane and premium, usually 92 or 93. Some premiums are 95 even 100 + octane. The ratings must be posted on bright yellow stickers on each gasoline pump.
What’s The Right Octane Level For Your Car?

Check your owner’s manual to determine the right octane level for your car. Regular octane is recommended for most cars. However, some cars with high compression engines, like sports cars and certain luxury cars, need mid-grade or premium gasoline to prevent knock.
How Can You Tell If You’re Using The Right Octane Level?
Listen to your car’s engine. If it doesn’t knock when you use the recommended octane, you’re using the right grade of gasoline.
Will Higher Octane Gasoline Clean Your Engine Better?
As a rule, high-octane gasoline does not outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car’s engine. In fact, the U.S. Environmental Protection Agency requires that all octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against the build-up of harmful levels of engine deposits during the expected life of your car.
Should You Ever Switch To A Higher Octane Gasoline?
A few car engines may knock or ping — even if you use the recommended octane. If this happens, try switching to the next highest octane grade. In many cases, switching to the mid-grade or premium-grade gasoline will eliminate the knock. If the knocking or pinging continues after one or two fill-ups, you may need a tune-up or some other repair. After that work is done, go back to the lowest octane grade at which your engine runs without knocking.
Is Knocking Harmful?
Occasional light knocking or pinging won’t harm your engine, and doesn’t indicate a need for higher octane. But don’t ignore severe knocking. A heavy or persistent knock can lead to engine damage.
Is All "Premium" Or "Regular" Gasoline The Same?
The octane rating of gasoline marked "premium" or "regular" is not consistent across the country. One state may require a minimum octane rating of 93 or 91 for all premium gasoline, while another may allow 89 octane to be called premium. To make sure you know what you’re buying, check the octane rating on the yellow sticker on the gas pump instead of relying on the name "premium" or "regular."
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Old 07-05-2011, 04:29 PM   #8 (permalink)
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I still don't understand the advantage of mixing pertaining to ethanol/detergents.

Costco says the same detergents are used in all grades. Around here all gas has 10% ethanol. So if it's not cost, why not just use 93?
91 octane burns cleaner than 93 in engine and pollutes air less {less carbon sulfur in both} and why they use it on west coast.
If not in west coast you can mix it or wait a bit
US EPA will mandate 91 and increase ethanol to 15% soon.
Detergents are more eff in lower octane.
93 octane is for 12+:1 compression cars and 100 octane is race grade F1.
Those w 14:1 mix all the time or just buy 95 airplane fuel.
Your MDX requires 91 octane with 11 :1 engine.
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Old 07-06-2011, 10:03 AM   #9 (permalink)
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Thanks for all the valuable inputs..
I have already started to mix together and seem to like it..
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Old 07-06-2011, 12:21 PM   #10 (permalink)
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Put in the lowest octane your engine will accept w/ knocking and all will be well - Been putting 87 in for 2 months now with no issues.

This'll probably cause "controversy" but no skin off my back...
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Old 07-06-2011, 01:01 PM   #11 (permalink)
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Been putting 87 in for 2 months now with no issues.
Maybe we should put together a "do not buy" list of owners who are willing to damage their engines, so that anyone considering buying used cars from them will be forewarned...
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