What octane do you use

[redneck ron]

90 proof.

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[Azzurro]

87 octane only. Why pay more?

 

[Boggus]

E85 all day

 

[bluebeastsrt]

100 octane.

 

[Quackfoo]

87 octane only. Why pay more?

Mainly because gas is cheap right now and with the reduced mileage you get from the lower octane you really aren't saving money.

 

[LETHAL]

93..after the first tank of 89 the dealer put in.

 

[mmdpg]

There is no way you loose 40 HP using 87 vs 91 or 93. My 2008 Bullitt is rated for 305 HP on 87 and 315 with 91 or 93. If it was more than 10-15 HP loss on the GT or the Eco boost I'd be really surprised.

 

[HavasuCat]

87 here, DD V6 getting 30 MPG, drive 85 miles daily, most are around 65-75 MPH.
Runs just fine.

 

[jasonstang]

91 on all my ICE things including the lawn mower.
I just don't like ethanol.

 

[jasonstang]

There is no way you loose 40 HP using 87 vs 91 or 93. My 2008 Bullitt is rated for 305 HP on 87 and 315 with 91 or 93. If it was more than 10-15 HP loss on the GT or the Eco boost I'd be really surprised.

It's about 40hp at mid rpm range vs 5hp at peak.

 

[RaceRed5.0]

I use 91 too bad there is no 93 here.

 

[65sohc]

There is no way you loose 40 HP using 87 vs 91 or 93. My 2008 Bullitt is rated for 305 HP on 87 and 315 with 91 or 93. If it was more than 10-15 HP loss on the GT or the Eco boost I'd be really surprised.

Turbocharged engines are much more sensitive to octane variation than mildly-tuned V8's. The PCM undoubtedly dials back boost as well as timing with 87.

 

[pike1346]

As title states what octane do you use for DD?
My Mustang has been sitting with my parents for the better part of 3 months 9 I've been deployed or moving to NC from NV) and I will finally be able to drive my '16 GT daily.

Compression Ratio 11.0:1

You want to run 93 in a coyote. The compression ratio is 11:1.

 

['Merica]

93, and top tier fuel only

 

[SpeedLu]

93, and top tier fuel only

What is "top tier." Shell with V-power? Chevron with Techron?

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