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thanks for the detailed explaination! and yes its a 6speed auto. wasnt sure if these were like earlier obd2 cars where you could really clean up the tune and make a decent difference. im on the fence...

so i sold my diesel and bought a '09 avlanche... my question is, would it be worth it to have it tuned? its bone stock and will prolly remain that way. im looking for better fuel economy and posibly...