How much horsepower will lower octane fuel cost you?
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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.
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...