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ECM programming on 2010 Honda Accord

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The 2011 Accords are advertising 34 MPG hiway. My 2010 with the same engine/power train is said to get 31 MPG hiway. Was this jump in hiway mileage improvement gained with only ECM programming?? Can I get the improved programming installed in my 2010 with out any adverse problems?
(1) Answer
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only your factory Honda dealer can answer that question.
if anyone else attempts this, it will likely void your warranty.