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Octane 91 is the minimum... I wouldn't go lower... I fill up with Octane 93 cause there are no gas stations around me that carry Octane 91
 

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Overworked Microsoft Peon
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I fill up with Chevron Supreme 92 octane... Actually, my TSX hasn't drank anything else.
 

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I use 89 octane (BP, Phillips 66/Conoco, Mobil/Esso), since there isn't 91 around here.
 

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eeh im a bad owner...Car runs fine on 89 octane as well...Dad filled it w/ regular once, felt a little underpowered, but ran w/ out knocking or anything... For the most Part Ill Run it 91 and up... But if Im low on cash, no real problem w/ 89, I At least try to keep it half and half
 

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-phase- said:
i agree..91 octane if i can..but if im low on cash..89 once in a while cant hurt too much right?
When I got my TSX almost two years ago I used to put in 93 octane, but during Summer 2004, I switched to 89 octane. Gas prices went up and my budget wasn't that high to keep paying for fuel and I travel a lot during the summers, so every penny counts. I haven't noticed any problems with 89. I wouldn't use 87 octane though....
 

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When lower or using un-recommended specified octane rating fuel. The ECU will retard ignition timing which prevents detonation and pinging. These 2 will no doubts cause engine damage. Whilst retarded ignition timing also means a reduction in power output, in some extremes up to 25% until when correct octane is re-detected. The ECU will slowly "un-retard" and return to specified performance levels.
 

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oh...and if something goes wrong with your car and the dealership finds that you're using an unrecommended octane gas (so they can blame it on that), your warranty is useless.

 

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Noel said:
When lower or using un-recommended specified octane rating fuel. The ECU will retard ignition timing which prevents detonation and pinging. These 2 will no doubts cause engine damage. Whilst retarded ignition timing also means a reduction in power output, in some extremes up to 25% until when correct octane is re-detected. The ECU will slowly "un-retard" and return to specified performance levels.
:nod: :nod:
100% correct.

old car won't do this but u will hear the knocking right away.
 

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Overworked Microsoft Peon
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JoeB18R said:
I will bet youmoney the owners manual says its okay to use lowr grade gasoline.
Pay up.

Page 184 (Acura TSX 2004):

"Use of a lower octane gasoline can cause a persistent, heavy metallic rapping noise in the engine that can lead to mechanical damage."
 

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Revenent said:
Pay up.

Page 184 (Acura TSX 2004):

"Use of a lower octane gasoline can cause a persistent, heavy metallic rapping noise in the engine that can lead to mechanical damage."
and thus will void parts of your warranty...
 
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