I am currently running 91 Premium Unleaded, and I saw 92 Power Premium for the same price, should I pump 92 instead of 91? and what is the different between the two?

 

Ya have to ask ....If your supercharged go with the 92! If not it won't matter....You could run 87 to save $$$

I wish they had 92 here instead of 91.

 

Octane is a measurement system that essentially measures a fuels resistance to predetonation. If you have high compression, a lot of timing advance, or a supercharger/turbocharger then higher octane fuel will slow the combustion in the cylinder and prevent predetonation. If you have none of those on your engine you are probably better off saving some money on regular unleaded.

 

Mine is fully stock, I even if I pump 91, I think the gas milage is still the same as 87 or 89, but since it only cost about 1or 2 bucks each time I fill up, so I thought 91 or 92 may make the car stronger. Don't know if this is true or not.

 

I know hi octane helps performance cars that can take advantage of the detonation deterrance. I think you will actually get more power and better mileage with plain old 87 octane. If the refinery is adding an additive to thwart pinging that means that in the same amount of volume there is less energy - and therefore - less power for a normal engine not designed for high octane.

 

Thanks Victor. That is the best explaination of octain use I have ever heard.

 

You're wasting money. Use 87