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Originally Posted by shylock
YUP!!!!!
In my 88 hb I run 93...it gets better gas milage and seems to run better...and thats just a d15.
Im my 93 integra...all I run is 93....and I am very happy with the gas milage and performance.
Anything less than 93 and its a waste.
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Yeah, a waste of money.
The octane rating of gasoline tells you how much the fuel can be compressed before it ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.
The compression ratio, or changing the spark timing, of your engine determines the octane rating of the gas you must use in the car. So a high compression ratio requires higher-octane fuel. Or, for instance, if you have your timing advanced. It doesnt mysteriously give you better gas mileage.