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Question about tuner

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Old 01-21-2012, 03:17 PM
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Question about tuner

A buddy of mine has a 2007 Chevy diesel and he asked me a question the other day that I couldn't even begin to answer. He put a Bully Dog tuner on it a while back. His question is 'How is it possible that the tuner gives him both more power and better mileage at the same time?'
Old 01-21-2012, 09:53 PM
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In a nut shell, they change the fuel mapping.
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