Which Grade of Fuel Do You Use?

[Megafast13]

Some say they provide advantages, others say the premium does nothing. Which do you use?

[Andy M.]

Regular seems to burn faster than premium in the SS. I stick with 89 octane or above.

Andy

[Bill Davidson]

Some say they provide advantages, others say the premium does nothing. Which do you use?

It all depends on your engine's compression ratio. Higher compression engines need higher octane fuel to avoid autoignition. If you are not getting autoignition with the fuel grade you are using, then moving up to a higher octane is simply a waste of money.

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.

[Mark Kleis]

It all depends on your engine's compression ratio. Higher compression engines need higher octane fuel to avoid autoignition. If you are not getting autoignition with the fuel grade you are using, then moving up to a higher octane is simply a waste of money.

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.

Agreed.

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.

[Murr1525]

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.

[J. A. Michaels]

Stick to what the manual states. I burn regular.

[Larry A]

I use regular, but I use Top Teir Gasoline , which in my case is Shell.

[AndrewR/T]

93 in the truck and 87 in everything else.

[Fly Bye]

I use aviation fuel.

[Cat]

The Fit doesn't like anything but Regular!

Cat :x