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Originally Posted by foff667
m6 LS1's downhill in 6th might get 30mpg but auto's wont. Mine got 18mpg with the stock converter & catback, got the converter & it went to 15-17 around town but about the same on the highway, got the heads/cam went to 11-13 pretty much doing just city driving. You need to stop getting tickets & accidents and your points/insurance will come down. Good luck.
lata
Bill
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ehh my old and beat lt1 gets better mpg, but then again its m6. m6 ftw!