What Octane are you using for the 5.0?

[IndustryLeech]

Nothing but 92, which is the highest octane generally available here.

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[CoyoteS550]

It's always run clean and smooth for me every time I've used it.

Thanks, I'll give it a shot.

 

[Demon Coyote]

93-Octane from Mobil

 

[Chris6G]

I'm pretty sure the dealer dumped 87 into mine. I was sure to fill it up with 93 as soon as I ran out. Still on that first tank of 93 (car pooling is great when i'm not the driver!)

 

[Mustang1260]

Running Shell and Sunoco 93
Trying to find higher apparently some Sunoco have 94 No Luck in VA so far with that or higher

Why? You DO NOT gain "power" from higher octane. Higher octane additives just allows a different tune/engine build.

 

[silver.gt]

were I live theres only 87 89 and 91 with up to 10% ethanol, I like to use 91 but does it make any difference, because I see every ones says the pure 93 does make a differences but would the 91 make any from the 87 in my area with 10% ethanol? Another thing I notice i think my car get better mpg with the 87, dont know why if its sopposed to be the other way around.

 

[Old 5 Oh]

92. Pure gas. No ethanol. Always.

Neither is available in CA. Gotta love the Golden State, the government knows what's best for us and makes us behave.

 

[Sc00ter]

I ran 92 or 93 octane only for the 1st 2,000 miles, averaged 15.5 mpg. Switched to 87 three tankfuls ago ($2.09 gal and still got 15.3-15.6 mpg. If anything, power comes on a hair smoother with regular.

 

[NavyChief]

92 only thing you can get in liberal OREGON:frusty:

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