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Old 04-06-2005, 04:21 AM   #1 (permalink)
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Is 91 octane required?
I am a new 2005 TSX owner and new to this forum, so I apologize in advance if my question has already been dealt with.

The manual says to use 91 octane fuel and the inside of the fuel door says that 91 octane is required. However, the Acura Web site says that lower octane fuel can be used with resulting lower power and possible knock.

Has anyone used regular unleaded in their TSX? If so, how much knock did you experience?
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Old 04-06-2005, 04:29 AM   #2 (permalink)
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I would not use lower octane unless you have a problem getting 91 octane. This car/engine requires high octane to produce the factory performance specifications. Knocking and retard timing can go as much as 50% power reduction depending on how "low quality" the fuel is.

Long term running incorrect octane rating is no different from buying a lower class car. Although no adverse effects, you most certainly aren't gonna be getting what you paid for to begin with.
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Old 04-06-2005, 11:37 AM   #3 (permalink)
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Why would you want to abuse your new baby that way? If I am not mistaken by using lower octane rating fuel you would also have to visit the gas pump more often. In the end it pretty much evens out financially - somewhere down the line you'd probably have to get something replaced for using lower octane than designated. I don't know much car tech, but it's just common sense to me.
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Old 04-06-2005, 12:47 PM   #4 (permalink)
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Originally Posted by rabbitman
I am a new 2005 TSX owner and new to this forum, so I apologize in advance if my question has already been dealt with.

The manual says to use 91 octane fuel and the inside of the fuel door says that 91 octane is required. However, the Acura Web site says that lower octane fuel can be used with resulting lower power and possible knock.

Has anyone used regular unleaded in their TSX? If so, how much knock did you experience?
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Old 04-06-2005, 12:51 PM   #5 (permalink)
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either highest octane or Evian for my b abe
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Old 04-06-2005, 02:17 PM   #6 (permalink)
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You can pull off Silver (Midgrade) everyonce in a while, which is what i do if im low on funds, But U want to use at least the 91% octane , Never Ran it on Regular, and dont plan too
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Old 04-06-2005, 06:07 PM   #7 (permalink)
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91 octane is about 1 dollar per liter here now...but never ever thought about use lower octane on my TSX...
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Old 04-06-2005, 06:26 PM   #8 (permalink)
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If using anything lower than 91 wasn't a problem I'll do it especially when 91 are $2.50/gallon.
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Old 04-06-2005, 10:13 PM   #9 (permalink)
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1 Gallon = 3.785 Liter :P

3.8 Canadian Dollars per Gallon....
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Old 04-06-2005, 10:43 PM   #10 (permalink)
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My local gas station is charging 2.89/gallon for premium
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Old 04-06-2005, 11:53 PM   #11 (permalink)
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2.39 USD for Premium but at least I get a little more octane - 93!
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Old 04-07-2005, 01:03 AM   #12 (permalink)
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just gassed ,

US$2.55 @ 93 Octane

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Old 06-21-2008, 02:50 PM   #13 (permalink)
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Post Fuel Grade
All difference aside, here is what expert say about the grade of fuel and the effect, i guess this will clear up the confiusion.
see the web link below

http://www.usatoday.com/money/autos/...emiumgas_x.htm
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Old 06-25-2008, 03:28 PM   #14 (permalink)
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How I long for the prices that were posted here in 2005!!!! We're talking about mid $4.xx now!!!!
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Old 06-25-2008, 05:19 PM   #15 (permalink)
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I've been using 91 octane on my '04 since day 1.
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