ECM programming on 2010 Honda Accord

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?

Asked by for the 2010 Honda Accord
1 answer
only your factory Honda dealer can answer that question.
if anyone else attempts this, it will likely void your warranty.