| cybulman |
What are most people filling?
93
91
89
Less.
CY |
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| RNguyen78 |
| I am filling with 91 or higher octane. My friend has a 2007 and is just using whatever's cheapest (86-87) and hasn't had anyproblems, but he's leasing his. I'm paying for mine so done want to risk it, so i use premium. |
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| bigpecs1 |
| I also use 91/93 in my 04 Maxima. I just filled it up a while ago and it's $3.18/gallon!:1pat: |
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| EXCALIBUR |
| I just tanked up this afternoon with 87 octane. Gas is $3.29/gallon here in Hawaii:( |
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| bigpecs1 |
quote:
Originally posted by cybulman
What are most people filling?
93
91
89
Less.
CY
btw, what do you use? |
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| mesalum |
| I've never seen anything higher than 91 here in Kalli fornia. |
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| Needsdecaf |
quote:
Originally posted by mesalum
I've never seen anything higher than 91 here in Kalli fornia.
Blame CARB. |
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| Needsdecaf |
From the manual:
Your vehicle is designed to operate on premium grade gasoline with a pump octane of 91 or higher. If this octane grade is not available, regular gasoline with an octane of 87 or higher may be used temporarily. The use of regular unleaded gasoline can cause metallic knocking noises in the engine and will result in decreased engine performance. The long term use of regular grade gasoline can lead to engine damage.
So what's cheaper, saving $166 a year on gas (12k miles a year, 18 MPG, $0.25 difference) or an engine rebuild because of a holed piston. :rolleyes:
Hey, $166 is $166, but if you can't afford the gas, don't buy the car. |
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| Squishy |
Notice what follows "can" and what follows "will"?
"Can" lead to engine damage, but not if you're not pushing the engine so much that audible knocking is heard. Inaudible knocking at low RPMs will cause negligable wear. |
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| Needsdecaf |
quote:
Originally posted by Squishy
Notice what follows "can" and what follows "will"?
"Can" lead to engine damage, but not if you're not pushing the engine so much that audible knocking is heard. Inaudible knocking at low RPMs will cause negligable wear.
On an 11.0 to 1 compression ratio engine, you're tempting fate. Do you think the warning is there for no reason?
Ping may be inaudible to your ears, but that does not mean it's not occurring. The knock sensor is far more sensitive than your ears. |
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| Squishy |
As long as the knock sensor can dial back timing enough to prevent audible knocking, negligable damage/wear occurs. Compression ratio isn't the only factor - combustion chamber design also affects what octane you can run. Some high compression engines respond better than others to lower octane fuel.
EDIT: From your post in "high test fuel", I gather that my compression ratio is 10.0:1, not 11.0:1. |
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| MDX Piotr |
| 91, but if I was on East Coast would put in 93. Only 91 available here. |
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| cybulman |
I'm using 93 but aoemtimeson highways youcant pcick and choose...87 is the highest and I drive off ! I try to go for 91 at the lowest.
I've seen signs on 91 in St. Louis saying contain 10% Ethanol.
Cy |
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| Needsdecaf |
quote:
Originally posted by cybulman
I'm using 93 but aoemtimeson highways youcant pcick and choose...87 is the highest and I drive off ! I try to go for 91 at the lowest.
I've seen signs on 91 in St. Louis saying contain 10% Ethanol.
Cy
10% Ethanol is fine. |
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| Squishy |
| Ethanol actually raises octane. I feel that's partly (or even mainly) the reason why octane requirements are lowered for California. |
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| csmeance |
quote:
Originally posted by Squishy
Ethanol actually raises octane. I feel that's partly (or even mainly) the reason why octane requirements are lowered for California.
But ethanol doesn't produce the same amount of power that regular fuel does, also it helps retain water, so there is a larger chance for water to be in the fuel. |
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| acurrate |
I put in 93 only b/c I can't find 91 on the east coast.
The only times I find 91 is at Sunoco, which has 91, but the difference is only like $.02 or $.03 a gallon, so I go for their 94 anyway. |
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| laborlitigator |
| I've been using 87 since the inception (have an 02) and 80K later, no problems. |
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| HuMan321 |
quote:
Originally posted by cybulman
What are most people filling?
93
91
89
Less.
CY
Maybe your poll should have segregated the 11:1 compression versus the 10:1 engines??? |
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| cybulman |
Compression ratios are too complicated for non-engineers to understand.
I just KISS !
Cy:D |
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| Needsdecaf |
quote:
Originally posted by HuMan321
Maybe your poll should have segregated the 11:1 compression versus the 10:1 engines???
The poll is in the 07 and up forum..... that compression ratio only applies to the '06 and eariler. |
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| HuMan321 |
quote:
Originally posted by Needsdecaf
The poll is in the 07 and up forum..... that compression ratio only applies to the '06 and eariler.
I know which forum the poll is in and I see others posting what fuel they use that have pre 2007 MDX's. If they are responding to the poll I thought it might have been clearer to seperate the 2 or 3 different engines in past MDX's
In other words, maybe lower octane doesn't matter as much in a 10:1 engine as an 11:1. If so and the data is mixed, it isn't as specific as it could be. |
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| coold8 |
| Premium, at $57k, why risk it it save a dollar at fillup? |
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| Squishy |
quote:
Originally posted by Needsdecaf
The poll is in the 07 and up forum..... that compression ratio only applies to the '06 and eariler.
Oops. To be honest I had no idea the compression ratios had actually changed throughout the model years. You can subtract one vote from 87. :) |
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| bbmd |
93, only from Shell.
For some weird reason, it would seem I get better mileage with it than with other brands. |
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| Autonomy |
quote:
Originally posted by bbmd
93, only from Shell.
For some weird reason, it would seem I get better mileage with it than with other brands.
Recently, I have been fill my 2007 MDX with 91 - Gas aint's cheap up in Canada (Alberta), about $1.00/liter, that is like ~$4.50/gal - canadian dollars
Yeah, this is interesting, you mentioned different brand of gasoline gives you better mileage. Is this true? I have been hearing others say the same thing.
I fill up at Esso (Exxon) up here and I noticed I get better mileage than the cheaper SuperStore brand. I don't know if anyone here has the same experience.
Maybe different brand uses different additives? |
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| Squishy |
| More likely one brand is E10 and the other brand is standard gasoline. You'll see a mileage drop with E10. |
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