What cyrnel and shakran said about octane is correct I'm sure.
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Originally Posted by Pain Train
I though above 87 was only for turbo/supercharged engines?
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Originally Posted by cyrnel
Last thought would be that _very_ few cars today are built to require anything above 87 .... I could be wrong but I don't think any street Hondas are in that category. Maybe NSX??
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Maybe it's those Honda X cars: for my '04 Acura TSX (Euro Accord in some parts of the world) which is factory stock and not super or turbocharged (yet) the factory recommends premium gas and you can notice increased sluggishness and reduced gas milage (I did not do a cost/benefit on milage) if you use regular octane; like said above, this car's ECU will adjust for it to prevent knock/detonation but power suffers.