How much horsepower will lower octane fuel cost you? - Ford Mustang Forum

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post #1 of 4 (permalink) Old 03-15-2013 Thread Starter
itezja's Avatar
Joined: May 2012
Location: Oskaloosa
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How much horsepower will lower octane fuel cost you?

How much horsepower will 89 octane fuel cost you vs 91/92? Any ideas?

2013 Mustang GT/CS
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post #2 of 4 (permalink) Old 03-15-2013
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Joined: Dec 2011
Location: Point Roberts
Posts: 1,634
It's gonna blow! Call the dealer! Ford ****** up!

Seriously, it'd be indiscernible, any difference between 91 and 89 could easily be explained by a myriad of other environmental or gas quality factors.

If it isn't pinging, run the lowest octane she'll take, that's where max power is.

2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.4 at 120.64

2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP
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post #3 of 4 (permalink) Old 03-15-2013
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It's been well publicized that the difference between regular and premium gas is about 10 hp in the GT. Using 89 will put you somewhere in between. Certainly not enough to lose any sleep over. If I remember right, it's in the owners manual as well.
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post #4 of 4 (permalink) Old 03-15-2013
5POINTO's Avatar
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1- It is in the owners manual, read all about it.
2- On 87 octane the engine produces “only” 402 horsepower and 377 lb-ft of torque.
3- You bought a $40,000 car, don't cheap out on a few bucks a tank full...
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