Some say they provide advantages, others say the premium does nothing. Which do you use?
Regular: 87 Octane
Premium: 89 Octane
Regular seems to burn faster than premium in the SS. I stick with 89 octane or above.
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Andy M. Moderator
It's not as simple as saying higher octane is better or worse. It's more of a question of whether or not it is needed for your engine.
Engines are tuned for a specific octane of fuel - running a higher octane fuel than your engine specifies can even be harmful.
Some engines (newer cars) have intelligent computers which will retard or advance timing based on the fuel provided, allowing the use of E85, 87,, 91 or 93 octane fuels to be used in the same car - BUT - most do not.
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Yeah, best to do what the manual says.
Mine just wants regular, some only want higher.
My dad's car has the variable timing for the grades of gas, but not sure if he has really compared the differences.
'08 Subaru Legacy 2.5i SE - Newport Blue Pearl
Stick to what the manual states. I burn regular.
quality creates its own demand
I use regular, but I use Top Teir Gasoline , which in my case is Shell.
93 in the truck and 87 in everything else.
I use aviation fuel.
The Fit doesn't like anything but Regular!
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