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Edmond,they must calculate the octain different.At our Sunoco here in south east Pa.,87 is economy,89is regular,91 is mid, 93 premium,94 ultra and 100gt racing.My suburban runs good on 89,which is mid-grade at other stations.My blazer needs 91.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires
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