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11-26-2011, 02:44 PM
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Registered User
Join Date: Mar 2009
Location: mulvane, KS
Posts: 200
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got my first oil change and gas milage took a nose drive
i have a 2011, scsb with 4.8. i finally got my first oil change at 5000mi. before i was getting 17 or 18mpg. i havent filled my tank to check exact milage but can tell gas milage has dropped quite a bit, so has performance. the dealership put their oil in it and i drove it home and put mobile 1 in it the next day. any ideals what could be goin on?
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