Premium or Super Unleaded ??

[mbrake59]

I just purchased a 2010 SHO w/PP. What gasoline octane do most of you run ?

 

[Dave]

93 Octane if you can get it. Otherwise, 91.

 

[typhoon5000]

If you're car is stock (without a tune), 91 is what you want for max performance and fuel economy out of the EcoBoost motor as it is what it was designed for. Putting 93 octane in a stock car won't give you any more power or run any better.

 

[SHOdded]

Should run 93 especially if you have ethanol in the fuel mix, 91 for pure gasoline. Avoid 87 if ethanol is in the mix, as you may actually be getting lower octane fuel, no way of really knowing without testing every time.