I was reading the July issue of Motortrend and they had a review on the Honda Odyssey mini van. I believe it has a 3.5 210hp motor in it. Anyways they put regular unleaded in it and they lost 5 hp and 12 lbs of torque comparred to using 91 or higher octane.

Just another FYI.

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Higher octane will give you more power... no doubt about that...

 

Sounds like something Motortruck would do.

 

i think it depends on the design of the engine. if you put regular unleaded in a premium only engine you might lose power, but using premium gas in an engine designed to burn regular unleaded will not give you additional power. feel free to correct me if i am wrong.

 

I don't think it would make a difference, since a higher octane is used on high compression engines because the higher the octane the less chances the fuel to ignite with compression. Like a supercharger, you have to used 93 octane or higher. My friend that has a 857hp Lexus and he has to put 110 octane or higher on his car. The octane rating of gasoline tells you the amount that the fuel can be compressed before if spontaneously 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 have happening. Lower octane gas (like "regular" 87 octane gasoline) can handle the least amount of compression before igniting. So by putting 87,89,91,93 octane gas WILL NOT INCREASE OR DECREASE HORSEPOWER Hope this helps.

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