Octane Rating - forums post summary

What octane rating should we use on a stock grand am?

Started 5 days, 14 hours ago (2009-11-07 13:05:00) by blondiez24gt

I looked on My gas cap, and didn't see it anywhere. My brother said if my cars 9.5:1 compression ratio I should at least be running 91 octane. I've always put 87 in it. With the exception of a couple fill ups. So what should I put in it?

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RE: What octane rating should we use on a stock grand am? - Page 2 - GrandAmGT.com Forum

Started 3 days, 3 hours ago (2009-11-09 23:57:00) by 2000 GT Coupe

Quote: Originally Posted by 350rs Really? Wow. Our 01 2500 HD ( not and ls1 i know, but based on it) is recomended to run on 87. When were pulling or hauling we use 93 though. it IS a very noticeable difference. The 2500 does not have the advanced timing that the vette does. I am unsure about the compression on it ...

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Sorry if noob repost... Best Octane rating for 929?

Started 1 week, 4 days ago (2009-11-01 08:47:00) by FireBlue

Sorry if this has been asked before 100times... In Melbourne we have 91ron, 95ron, 98ron, 99ron and 100 available at the pumps. Is there any benefit to running an octane higher than 91ron? has anyone done comparative dynos with different fuels? We have 10%ethanol too but i hear this **** degrades rubber parts?

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Octane rating

Started 1 month ago (2009-10-13 18:46:00) by corbtown

I was told recently that the higher the octane rating the hotter the engine burns. I've always followed bmw octane recommendation and fueled with the highest rating, but is the hotter temperature burn ok offsetting the octane benefit? What about going mid octane rating? If your only tool is a hammer, every problem starts to look like a nail !! Everyman is the architect of his own...

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Unleaded Octane Rating

Started 1 month ago (2009-10-07 14:09:00) by mark95man

In 2005, I moved from NJ to AZ . The highest unleaded octane was 91 in AZ vs 93 in NJ. This past week, I took a road trip to New Mexico--the US State located just to the East of AZ. I noticed the unleaded regular octane rating in N.M. was 86, not 87. Can anyone explain why the regular unleaded is 86 in New Mexico? The altitude was +6,000 feet in the area I visited. When I ...

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octane rating higher than 91 bad too?

Started 1 month, 1 week ago (2009-10-06 09:28:00) by Maury

Our cars call for 91. I've been using 93 faithfully, and over the past few months I'm one of those guys who's experienced pre-ignition BS. Did some chevron treatments, changed plugs and air filter and it went away 95%. Lately it started coming back a little bit. I filled up with 91 for the first time and its quieted back to 95% gone. Is 93 as bad as 87, since our cars want 91???

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Octane rating

Started 2 months ago (2009-09-13 17:49:00) by ccmnova

Been using 89 octane in my 09 TI. Tried a tank of 93 octane and didn't notice much difference. I hope that the 89, and 93 for that matter, are OK with the engine which I believe is designed for 91 octane. What are most of you running ?

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2002 Rodeo 3.2 Octane Rating?

Started 2 months, 2 weeks ago (2009-08-24 18:37:00) by Troops

What's the recommended octane gas for a 2002 Rodeo 3.2? I've been running 89 but it still pings _________________ Got to get my Trooper back on the road!

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What is the minimum octane gas rating for a 2001 Mitsubishi Galant ES V6?

Started 2 months, 2 weeks ago (2009-08-29 21:46:00) by TXLonghorn76

What is the minimum octane gas rating for a 2001 Mitsubishi Galant ES V6?

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RE: octane rating to use on new vitara

Started 3 days, 10 hours ago (2009-11-09 17:09:00) by mazdamazda

You'll get a slightly worse fuel economy and slow acceleration if you try to use a lower octane gasoline (since new ECUs will try to compensate for that).

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General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio

RE: Ethanol raises the octane rating and manufacturers use it to bump up the premium

Started 1 week ago (2009-11-05 18:30:00) by undecided

Quote: Originally Posted by Kilgore Trout Is this true? Does 89 really have lower ethanol content than 89? If so, I'm switching to 89 for good. octane rating cheaply. Of course, since 10% is mandated in the USA , I'd think that even 87 octane gas has 10% ethanol.

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