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when i first get a car, i'll try each type and see which one the car likes better, based on gas mileage and performance. and then i'll only use one kind after that's been determined. my 98 civic ran best on cheveron 87. my 98 chevy 1500 silverado pick-up runs best on 76 89 octane. and my '02 TL runs best on mobil 91. the TL actually requires 91, btw. otherwise i'd use a different octane, heh.
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