Yep the owner manual states that you can use 87 if you have to but does not recommend it. It is true on a lot of the tests that have been done lately that you can run the regular on a regular car on a regular day, but your car is not regular, and I am sure you don't always drive it regular either. High compression supercharged motor,
It's a lot better to run premium all the time on that motor then say a corvette that requires 91 octane due to the vette doesn't nearly run as much pressure in the cylinders as our motors. If you have a vehicle that says that you must use only 91 octane period, then like my brother you can fry out your rings like he did in his Toyota Celica GTS. Cost him $3000 to have the piston rings changed and the engine bored out, due to him thinking that premium is not required!!!!!!
Fortunately since our motors are highly computer controlled and adjust themselves 32 times per one rotation of the crank, it can detune the motor and back off timing to keep from getting PING or DETENATION when running lower octane in case of an emergency!
