The car is designed for low octane fuel for a reason. Useing higher octane which burns hotter can cause a couple of problems. If you live in a hot climate it could cause vapor lock. According to the national average you do not get any signifigant gains in either power or fuel milage. You can choose its your car. Give me your e-mail adress and i will send you some paperwork explaining octane rateings alittle more
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