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mmm i use 91...i dont think there are any 93 octane in the LA area. LOL to whoever said they drive their GSR and Si the same...what point does that make? two complete different cars with 2 complete different compresion ratios. What you said dont make sense. For your own protection, i hope you start putting in the proper type of fuel your car needs, no one on here wants you to learn it the hard way.
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