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Sorry to revive thread but why do you guys support 91 octane so much? What's so different about the TSX from a Honda Accord & CRV which uses the exact same K24 and same ECU but does not say 91 octane ????
Engine high compression ratio = 91 octane
https://en.wikipedia.org/wiki/Honda_K_engine#K24A1


Acura states to pump 91 octane for the TSX and that is why it is supported so much.
 

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If you run less than the specified octane, modern engines will adapt by reducing the performance and preventing *most* of the damaging pre-ignition. You'll most likely also suffer a mileage hit...

If you drive like a granny at all (and I do mean ALL) times, low octane probably won't hurt much.
 

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seriously u guys... if you guys dont want to use 91+ then theres no point of buying a car that runs 91. You guys knew what you guys were up against when buying the tsx. The engine was designed to run 91+ because of high compression. if u guys want to run anything lower then go for it. It ain't my car.



cali only has 91 :O
Roughly 91 is sold west of the Mississippi, and 93 east of the Mississippi. Exceptions are Illinois, Wisconsin, and Minnesota which sell 91, and Texas which sells 93. IIRC Missouri varies within the state
 
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