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
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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?

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post #2 of 4 (permalink) Old 03-15-2013
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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.
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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
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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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