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If I run 87 in mine (82) I get alot of predetionation under hard throttle. 89 is a little better but still not too quiet. We don't have 91 where I live so I feed my SC93. With $.10 diff. per grade it only costs me $4.00 exrta to use the good stuff if I let it get that low. Just go with the higher grade and drive hard&happy
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Electrical problems on a pick-up will do that to a guy- 1990C4S
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